Add copy_tags_to_snapshot attribute for aws_rds_cluster resource

[teraken0509]

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Fixes #8504

Release note for CHANGELOG:

- resource/aws_rds_cluster: Add `copy_tags_to_snapshot` attribute.

Output from acceptance testing:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSRDSCluster_copyTagsToSnapshot'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSRDSCluster_copyTagsToSnapshot -timeout 120m
=== RUN   TestAccAWSRDSCluster_copyTagsToSnapshot
=== PAUSE TestAccAWSRDSCluster_copyTagsToSnapshot
=== CONT  TestAccAWSRDSCluster_copyTagsToSnapshot
--- PASS: TestAccAWSRDSCluster_copyTagsToSnapshot (232.40s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	232.474s

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSRDSCluster_basic'
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -parallel 20 -run=TestAccAWSRDSCluster_basic -timeout 120m
=== RUN   TestAccAWSRDSCluster_basic
=== PAUSE TestAccAWSRDSCluster_basic
=== CONT  TestAccAWSRDSCluster_basic
--- PASS: TestAccAWSRDSCluster_basic (139.82s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	139.890s

[bflad]

LGTM, thanks @kterada0509! 🚀

Output from acceptance testing (failures unrelated):

--- PASS: TestAccAWSRDSCluster_missingUserNameCausesError (8.23s)
--- PASS: TestAccAWSRDSCluster_generatedName (118.76s)
--- PASS: TestAccAWSRDSCluster_iamAuth (133.74s)
--- PASS: TestAccAWSRDSCluster_basic (135.21s)
--- PASS: TestAccAWSRDSCluster_EngineMode_Global (135.91s)
--- PASS: TestAccAWSRDSCluster_EngineMode_ParallelQuery (130.33s)
--- PASS: TestAccAWSRDSCluster_namePrefix (140.09s)
--- PASS: TestAccAWSRDSCluster_updateIamRoles (140.21s)
--- PASS: TestAccAWSRDSCluster_encrypted (153.50s)
--- PASS: TestAccAWSRDSCluster_kmsKey (154.07s)
--- PASS: TestAccAWSRDSCluster_takeFinalSnapshot (155.08s)
--- PASS: TestAccAWSRDSCluster_backupsUpdate (159.76s)
--- PASS: TestAccAWSRDSCluster_BacktrackWindow (159.96s)
--- PASS: TestAccAWSRDSCluster_updateCloudwatchLogsExports (160.26s)
--- PASS: TestAccAWSRDSCluster_DeletionProtection (160.13s)
--- PASS: TestAccAWSRDSCluster_importBasic (163.44s)
--- PASS: TestAccAWSRDSCluster_copyTagsToSnapshot (194.51s)
--- PASS: TestAccAWSRDSCluster_updateTags (198.33s)
--- FAIL: TestAccAWSRDSCluster_EngineMode (244.24s)
--- PASS: TestAccAWSRDSCluster_GlobalClusterIdentifier_Remove (117.49s)
--- PASS: TestAccAWSRDSCluster_GlobalClusterIdentifier (123.87s)
--- PASS: TestAccAWSRDSCluster_EngineVersion (140.30s)
--- PASS: TestAccAWSRDSCluster_GlobalClusterIdentifier_Update (125.12s)
--- PASS: TestAccAWSRDSCluster_GlobalClusterIdentifier_Add (132.93s)
--- PASS: TestAccAWSRDSCluster_ScalingConfiguration (237.46s)
--- PASS: TestAccAWSRDSCluster_Port (264.56s)
--- FAIL: TestAccAWSRDSCluster_SnapshotIdentifier_PreferredBackupWindow (302.40s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_EngineMode_ParallelQuery (325.88s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_EngineMode_Provisioned (326.02s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_Tags (305.00s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier (355.23s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_EngineVersion_Equal (366.29s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_EngineVersion_Different (386.41s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_DeletionProtection (391.52s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_PreferredMaintenanceWindow (356.47s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_VpcSecurityGroupIds (348.51s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_EncryptedRestore (335.61s)
--- PASS: TestAccAWSRDSCluster_SnapshotIdentifier_VpcSecurityGroupIds_Tags (358.16s)
--- PASS: TestAccAWSRDSCluster_EngineVersionWithPrimaryInstance (1122.78s)
--- FAIL: TestAccAWSRDSCluster_s3Restore (1462.12s)
--- PASS: TestAccAWSRDSCluster_EncryptedCrossRegionReplication (2975.03s)

[bflad]

This has been released in version 2.10.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!