kms/key: Preserve order in JSON policy lists

[YakDriver]

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Related #21968
Related #11801
Closes #20665

Output from acceptance testing (us-west-2):

% make testacc TESTS=TestAccKMSKey PKG=kms
--- PASS: TestAccKMSKey_disappears (21.67s)
--- PASS: TestAccKMSKeyDataSource_basic (26.00s)
--- PASS: TestAccKMSKeyDataSource_multiRegionConfiguration (26.02s)
--- PASS: TestAccKMSKey_asymmetricKey (26.17s)
--- PASS: TestAccKMSKey_multiRegion (29.32s)
--- PASS: TestAccKMSKey_basic (29.34s)
--- PASS: TestAccKMSKeyDataSource_grantToken (35.02s)
--- PASS: TestAccKMSKey_Policy_iamRole (45.03s)
--- PASS: TestAccKMSKey_Policy_basic (48.86s)
--- PASS: TestAccKMSKey_Policy_bypassUpdate (48.93s)
--- PASS: TestAccKMSKey_Policy_iamServiceLinkedRole (56.73s)
--- PASS: TestAccKMSKey_Policy_iamRoleOrder (72.36s)
--- PASS: TestAccKMSKey_tags (149.78s)
--- PASS: TestAccKMSKey_Policy_bypass (151.11s)
--- PASS: TestAccKMSKey_isEnabled (311.59s)

Output from acceptance testing (GovCloud):

--- PASS: TestAccKMSKey_disappears (26.33s)
--- PASS: TestAccKMSKey_asymmetricKey (30.51s)
--- PASS: TestAccKMSKeyDataSource_multiRegionConfiguration (31.29s)
--- PASS: TestAccKMSKeyDataSource_basic (31.31s)
--- PASS: TestAccKMSKey_basic (34.49s)
--- PASS: TestAccKMSKey_multiRegion (35.02s)
--- PASS: TestAccKMSKeyDataSource_grantToken (37.59s)
--- PASS: TestAccKMSKey_Policy_iamRole (50.01s)
--- PASS: TestAccKMSKey_Policy_basic (52.51s)
--- PASS: TestAccKMSKey_Policy_iamServiceLinkedRole (58.46s)
--- PASS: TestAccKMSKey_Policy_iamRoleOrder (81.80s)
--- PASS: TestAccKMSKey_Policy_bypassUpdate (137.10s)
--- PASS: TestAccKMSKey_Policy_bypass (161.55s)
--- PASS: TestAccKMSKey_tags (212.49s)
--- PASS: TestAccKMSKey_isEnabled (301.09s)

[ewbankkit]

LGTM 🚀.

% make testacc TESTS=TestAccKMSKey_ PKG=kms
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./internal/service/kms/... -v -count 1 -parallel 20 -run='TestAccKMSKey_' -timeout 180m
=== RUN   TestAccKMSKey_basic
=== PAUSE TestAccKMSKey_basic
=== RUN   TestAccKMSKey_disappears
=== PAUSE TestAccKMSKey_disappears
=== RUN   TestAccKMSKey_multiRegion
=== PAUSE TestAccKMSKey_multiRegion
=== RUN   TestAccKMSKey_asymmetricKey
=== PAUSE TestAccKMSKey_asymmetricKey
=== RUN   TestAccKMSKey_Policy_basic
=== PAUSE TestAccKMSKey_Policy_basic
=== RUN   TestAccKMSKey_Policy_bypass
=== PAUSE TestAccKMSKey_Policy_bypass
=== RUN   TestAccKMSKey_Policy_bypassUpdate
=== PAUSE TestAccKMSKey_Policy_bypassUpdate
=== RUN   TestAccKMSKey_Policy_iamRole
=== PAUSE TestAccKMSKey_Policy_iamRole
=== RUN   TestAccKMSKey_Policy_iamRoleOrder
=== PAUSE TestAccKMSKey_Policy_iamRoleOrder
=== RUN   TestAccKMSKey_Policy_iamServiceLinkedRole
=== PAUSE TestAccKMSKey_Policy_iamServiceLinkedRole
=== RUN   TestAccKMSKey_isEnabled
=== PAUSE TestAccKMSKey_isEnabled
=== RUN   TestAccKMSKey_tags
=== PAUSE TestAccKMSKey_tags
=== CONT  TestAccKMSKey_basic
=== CONT  TestAccKMSKey_Policy_iamRole
=== CONT  TestAccKMSKey_isEnabled
=== CONT  TestAccKMSKey_Policy_iamRoleOrder
=== CONT  TestAccKMSKey_Policy_iamServiceLinkedRole
=== CONT  TestAccKMSKey_tags
=== CONT  TestAccKMSKey_Policy_bypass
=== CONT  TestAccKMSKey_Policy_basic
=== CONT  TestAccKMSKey_Policy_bypassUpdate
=== CONT  TestAccKMSKey_multiRegion
=== CONT  TestAccKMSKey_asymmetricKey
=== CONT  TestAccKMSKey_disappears
--- PASS: TestAccKMSKey_disappears (19.10s)
--- PASS: TestAccKMSKey_asymmetricKey (24.12s)
--- PASS: TestAccKMSKey_multiRegion (27.49s)
--- PASS: TestAccKMSKey_basic (27.59s)
--- PASS: TestAccKMSKey_Policy_iamRole (44.76s)
--- PASS: TestAccKMSKey_Policy_basic (45.60s)
--- PASS: TestAccKMSKey_Policy_bypassUpdate (45.69s)
--- PASS: TestAccKMSKey_Policy_iamServiceLinkedRole (53.87s)
--- PASS: TestAccKMSKey_tags (70.64s)
--- PASS: TestAccKMSKey_Policy_iamRoleOrder (76.46s)
--- PASS: TestAccKMSKey_Policy_bypass (152.94s)
--- PASS: TestAccKMSKey_isEnabled (283.55s)
PASS
ok  	github.com/hashicorp/terraform-provider-aws/internal/service/kms	287.176s

[github-actions]

This functionality has been released in v3.68.0 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]

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