samples(parametermanager): Added global and regional samples for the kms_key field in Parameter Manager.

[vatsal-vora-crestdata]

Description

Created samples for the kms_key field in the global and regional Parameter Manager API.

Samples List:

1. create_param_with_kms_key
2. create_regional_param_with_kms_key
3. update_param_kms_key
4. update_regional_param_kms_key
5. remove_param_kms_key
6. remove_regional_param_kms_key

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• google-cloud-parameter_manager/samples/create_param_with_kms_key.rb:15, tag parametermanager_create_param_with_kms_key
• google-cloud-parameter_manager/samples/create_regional_param_with_kms_key.rb:15, tag parametermanager_create_regional_param_with_kms_key
• google-cloud-parameter_manager/samples/remove_param_kms_key.rb:15, tag parametermanager_remove_param_kms_key
• google-cloud-parameter_manager/samples/remove_regional_param_kms_key.rb:15, tag parametermanager_remove_regional_param_kms_key
• google-cloud-parameter_manager/samples/update_param_kms_key.rb:15, tag parametermanager_update_param_kms_key
• google-cloud-parameter_manager/samples/update_regional_param_kms_key.rb:15, tag parametermanager_update_regional_param_kms_key

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[durgesh-ninave-crest]

Raised a duplicate of this PR #29451 because Vatsal's CLA has expired, which is blocking the merge. Once the new PR is merged, will close the original one.