feat(rds): allow DatabaseClusterFromSnapshot to set copyTagsToSnapshot property (#19932)

This change will now allow users to set `copyTagsToSnapshot` attribute for the `DatabaseClusterFromSnapshot`.

This will now be consistent with the way the database instance works.

_Integration test may not be possible since this requires a valid snapshot to pre-exist before building the CDK stack to generate the CDK local snapshot._

_It might be possible to add a snapshot first by creating a new DB Cluster taking a manual snapshot then using that in `DatabaseClusterFromSnapshot` but it will become a hassle for anyone else in future to maintain or update since they will always need to proceed in the same manner to get the exact snapshot._ 

_An integration test for `copyTagsToSnapshot` already exists for `DatabaseCluster` in `integ.cluster.js` which is passing successfully on executing the tests._

Closes #19884

----

### All Submissions:

* [X] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: AnuragMohapatra

packages/@aws-cdk/aws-rds/lib/cluster.ts

@@ -259,12 +259,19 @@ interface DatabaseClusterBaseProps {
   readonly storageEncrypted?: boolean
 
   /**
-  * The KMS key for storage encryption.
-  * If specified, {@link storageEncrypted} will be set to `true`.
-  *
-  * @default - if storageEncrypted is true then the default master key, no key otherwise
-  */
+   * The KMS key for storage encryption.
+   * If specified, {@link storageEncrypted} will be set to `true`.
+   *
+   * @default - if storageEncrypted is true then the default master key, no key otherwise
+   */
   readonly storageEncryptionKey?: kms.IKey;
+
+  /**
+   * Whether to copy tags to the snapshot when a snapshot is created.
+   *
+   * @default - true
+   */
+  readonly copyTagsToSnapshot?: boolean;
 }
 
 /**
@@ -425,6 +432,8 @@ abstract class DatabaseClusterNew extends DatabaseClusterBase {
       // Encryption
       kmsKeyId: props.storageEncryptionKey?.keyArn,
       storageEncrypted: props.storageEncryptionKey ? true : props.storageEncrypted,
+      // Tags
+      copyTagsToSnapshot: props.copyTagsToSnapshot ?? true,
     };
   }
 }
@@ -501,13 +510,6 @@ export interface DatabaseClusterProps extends DatabaseClusterBaseProps {
    * @default - A username of 'admin' (or 'postgres' for PostgreSQL) and SecretsManager-generated password
    */
   readonly credentials?: Credentials;
-
-  /**
-   * Whether to copy tags to the snapshot when a snapshot is created.
-   *
-   * @default: true
-   */
-  readonly copyTagsToSnapshot?: boolean;
 }
 
 /**
@@ -558,8 +560,6 @@ export class DatabaseCluster extends DatabaseClusterNew {
       // Admin
       masterUsername: credentials.username,
       masterUserPassword: credentials.password?.unsafeUnwrap(),
-      // Tags
-      copyTagsToSnapshot: props.copyTagsToSnapshot ?? true,
     });
 
     this.clusterIdentifier = cluster.ref;

packages/@aws-cdk/aws-rds/test/cluster.test.ts

@@ -1997,6 +1997,7 @@ describe('cluster', () => {
         VpcSecurityGroupIds: [{ 'Fn::GetAtt': ['DatabaseSecurityGroup5C91FDCB', 'GroupId'] }],
         SnapshotIdentifier: 'mySnapshot',
         EnableIAMDatabaseAuthentication: true,
+        CopyTagsToSnapshot: true,
       },
       DeletionPolicy: 'Snapshot',
       UpdateReplacePolicy: 'Snapshot',