Add timezone argument to aws_backup_plan

[autotune]

Description

The aws_backup_plan lets you set the cron schedule in the rule block, but does not allow you to set which timezone the cron schedule should be evaluated in, which means that it defaults to UTC. The AWS console and the AWS CLI both support setting the timezone.

Expected Terraform Configuration

resource "aws_backup_plan" "example" {
  name = "tf_example_backup_plan"

  rule {
    rule_name         = "tf_example_backup_rule"
    target_vault_name = aws_backup_vault.test.name
    schedule          = "cron(0 12 * * ? *)"
    schedule_timezone = "Pacific/Fiji"

    lifecycle {
      delete_after = 14
    }
  }

  advanced_backup_setting {
    backup_options = {
      WindowsVSS = "enabled"
    }
    resource_type = "EC2"
  }
}

Relations

Closes #33605

References

ScheduleExpressionTimezone

Output from Acceptance Testing

==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/backup/... -v -count 1 -parallel 20 -run='TestAccBackupPlan_basic'  -timeout 360m
=== RUN   TestAccBackupPlan_basic
=== PAUSE TestAccBackupPlan_basic
=== CONT  TestAccBackupPlan_basic
--- PASS: TestAccBackupPlan_basic (20.82s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/backup	22.898s```

[github-actions]

Community Note

Voting for Prioritization

• Please vote on this pull request by adding a 👍 reaction to the original post to help the community and maintainers prioritize this pull request.
• Please see our prioritization guide for information on how we prioritize.
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for issue followers and do not help prioritize the request.

For Submitters

• Review the contribution guide relating to the type of change you are making to ensure all of the necessary steps have been taken.
• For new resources and data sources, use skaff to generate scaffolding with comments detailing common expectations.
• Whether or not the branch has been rebased will not impact prioritization, but doing so is always a welcome surprise.

[ewbankkit]

LGTM 🚀.

% make testacc TESTARGS='-run=TestAccBackupPlan_' PKG=backup ACCTEST_PARALLELISM=3
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.1 test ./internal/service/backup/... -v -count 1 -parallel 3  -run=TestAccBackupPlan_ -timeout 360m
=== RUN   TestAccBackupPlan_basic
=== PAUSE TestAccBackupPlan_basic
=== RUN   TestAccBackupPlan_disappears
=== PAUSE TestAccBackupPlan_disappears
=== RUN   TestAccBackupPlan_tags
=== PAUSE TestAccBackupPlan_tags
=== RUN   TestAccBackupPlan_withRules
=== PAUSE TestAccBackupPlan_withRules
=== RUN   TestAccBackupPlan_withLifecycle
=== PAUSE TestAccBackupPlan_withLifecycle
=== RUN   TestAccBackupPlan_withRecoveryPointTags
=== PAUSE TestAccBackupPlan_withRecoveryPointTags
=== RUN   TestAccBackupPlan_RuleCopyAction_sameRegion
=== PAUSE TestAccBackupPlan_RuleCopyAction_sameRegion
=== RUN   TestAccBackupPlan_RuleCopyAction_noLifecycle
=== PAUSE TestAccBackupPlan_RuleCopyAction_noLifecycle
=== RUN   TestAccBackupPlan_RuleCopyAction_multiple
=== PAUSE TestAccBackupPlan_RuleCopyAction_multiple
=== RUN   TestAccBackupPlan_RuleCopyAction_crossRegion
=== PAUSE TestAccBackupPlan_RuleCopyAction_crossRegion
=== RUN   TestAccBackupPlan_advancedBackupSetting
=== PAUSE TestAccBackupPlan_advancedBackupSetting
=== RUN   TestAccBackupPlan_enableContinuousBackup
=== PAUSE TestAccBackupPlan_enableContinuousBackup
=== RUN   TestAccBackupPlan_upgradeScheduleExpressionTimezone
=== PAUSE TestAccBackupPlan_upgradeScheduleExpressionTimezone
=== RUN   TestAccBackupPlan_scheduleExpressionTimezone
=== PAUSE TestAccBackupPlan_scheduleExpressionTimezone
=== CONT  TestAccBackupPlan_basic
=== CONT  TestAccBackupPlan_RuleCopyAction_noLifecycle
=== CONT  TestAccBackupPlan_enableContinuousBackup
--- PASS: TestAccBackupPlan_basic (14.77s)
=== CONT  TestAccBackupPlan_scheduleExpressionTimezone
--- PASS: TestAccBackupPlan_enableContinuousBackup (14.77s)
=== CONT  TestAccBackupPlan_upgradeScheduleExpressionTimezone
--- PASS: TestAccBackupPlan_RuleCopyAction_noLifecycle (33.78s)
=== CONT  TestAccBackupPlan_tags
--- PASS: TestAccBackupPlan_scheduleExpressionTimezone (24.19s)
=== CONT  TestAccBackupPlan_withRules
=== CONT  TestAccBackupPlan_RuleCopyAction_crossRegion
--- PASS: TestAccBackupPlan_upgradeScheduleExpressionTimezone (42.54s)
--- PASS: TestAccBackupPlan_tags (32.59s)
=== CONT  TestAccBackupPlan_advancedBackupSetting
--- PASS: TestAccBackupPlan_withRules (30.36s)
=== CONT  TestAccBackupPlan_RuleCopyAction_sameRegion
--- PASS: TestAccBackupPlan_RuleCopyAction_crossRegion (20.61s)
=== CONT  TestAccBackupPlan_RuleCopyAction_multiple
--- PASS: TestAccBackupPlan_advancedBackupSetting (21.65s)
=== CONT  TestAccBackupPlan_withRecoveryPointTags
--- PASS: TestAccBackupPlan_RuleCopyAction_multiple (13.72s)
=== CONT  TestAccBackupPlan_disappears
--- PASS: TestAccBackupPlan_RuleCopyAction_sameRegion (30.38s)
=== CONT  TestAccBackupPlan_withLifecycle
--- PASS: TestAccBackupPlan_disappears (11.44s)
--- PASS: TestAccBackupPlan_withRecoveryPointTags (29.84s)
--- PASS: TestAccBackupPlan_withLifecycle (46.04s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/backup	151.194s

% make testacc TESTARGS='-run=TestAccBackupPlanDataSource_' PKG=backup ACCTEST_PARALLELISM=3
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.1 test ./internal/service/backup/... -v -count 1 -parallel 3  -run=TestAccBackupPlanDataSource_ -timeout 360m
=== RUN   TestAccBackupPlanDataSource_basic
=== PAUSE TestAccBackupPlanDataSource_basic
=== CONT  TestAccBackupPlanDataSource_basic
--- PASS: TestAccBackupPlanDataSource_basic (12.24s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/backup	17.578s

[ewbankkit]

@autotune Thanks for the contribution 🎉 👏.

[github-actions]

This functionality has been released in v5.72.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.