aws_rds_global_cluster: Add endpoint attribute for DB writer endpoint

[ppapishe]

Description

AWS Started supporting global endpoint for global aurora clusters. This PR is to basically add the new endpoint attribute as a new output attribute.

This basically solves #39862

Relations

Closes #39862

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[github-actions]

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[github-actions]

Welcome @ppapishe 👋

It looks like this is your first Pull Request submission to the Terraform AWS Provider! If you haven’t already done so please make sure you have checked out our CONTRIBUTOR guide and FAQ to make sure your contribution is adhering to best practice and has all the necessary elements in place for a successful approval.

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[YakDriver]

@ppapishe Thanks for your contribution! I cleaned up a few things and will work on getting this merged.

[YakDriver]

LGTM 🎉

% make t T=TestAccRDSGlobalCluster_basic K=rds
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go1.23.2 test ./internal/service/rds/... -v -count 1 -parallel 20 -run='TestAccRDSGlobalCluster_basic'  -timeout 360m
2024/11/14 15:08:06 Initializing Terraform AWS Provider...
=== RUN   TestAccRDSGlobalCluster_basic
=== PAUSE TestAccRDSGlobalCluster_basic
=== CONT  TestAccRDSGlobalCluster_basic
--- PASS: TestAccRDSGlobalCluster_basic (16.11s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/rds	20.188s