chore: add code samples for secret manager tag integration

[YashSaraf11]

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea.
• Follow the instructions in CONTRIBUTING. Most importantly, ensure the tests and linter pass by running bundle exec rake ci in the gem subdirectory.
• Update code documentation if necessary.

closes: #<30589>

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• google-cloud-secret_manager/samples/create_regional_secret_with_tags.rb:15, tag secretmanager_create_regional_secret_with_tags
• google-cloud-secret_manager/samples/create_secret_with_tags.rb:15, tag secretmanager_create_secret_with_tags

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