feat(secretmanager): Added samples related to Secret Expiration

[dhavalbhensdadiya-crest]

As part of this feature, we have added global and regional samples for below features:

1. Create Secret With Expiration
2. Update Secret With Expiration
3. Remove expiration from Secret

Please merge this PR once approved

[snippet-bot]

Here is the summary of changes.

You are about to add 20 region tags.

• secretmanager/src/create_regional_secret_with_expiration.php:28, tag secretmanager_create_regional_secret_with_expiration
• secretmanager/src/create_secret_with_expiration.php:28, tag secretmanager_create_secret_with_expiration
• secretmanager/src/delete_regional_secret_expiration.php:28, tag secretmanager_delete_regional_secret_expiration
• secretmanager/src/delete_regional_secret_using_etag.php:28, tag secretmanager_delete_regional_secret_using_etag
• secretmanager/src/delete_secret_expiration.php:28, tag secretmanager_delete_secret_expiration
• secretmanager/src/delete_secret_using_etag.php:28, tag secretmanager_delete_secret_using_etag
• secretmanager/src/destroy_regional_secret_version_using_etag.php:28, tag secretmanager_destroy_regional_secret_version_using_etag
• secretmanager/src/destroy_secret_version_using_etag.php:28, tag secretmanager_destroy_secret_version_using_etag
• secretmanager/src/disable_regional_secret_version_using_etag.php:28, tag secretmanager_disable_regional_secret_version_using_etag
• secretmanager/src/disable_secret_version_using_etag.php:28, tag secretmanager_disable_secret_version_using_etag
• secretmanager/src/enable_regional_secret_version_using_etag.php:28, tag secretmanager_enable_regional_secret_version_using_etag
• secretmanager/src/enable_secret_version_using_etag.php:28, tag secretmanager_enable_secret_version_using_etag
• secretmanager/src/list_regional_secret_versions_with_filter.php:28, tag secretmanager_list_regional_secret_versions_with_filter
• secretmanager/src/list_regional_secrets_with_filter.php:28, tag secretmanager_list_regional_secrets_with_filter
• secretmanager/src/list_secret_versions_with_filter.php:28, tag secretmanager_list_secret_versions_with_filter
• secretmanager/src/list_secrets_with_filter.php:28, tag secretmanager_list_secrets_with_filter
• secretmanager/src/update_regional_secret_using_etag.php:28, tag secretmanager_update_regional_secret_using_etag
• secretmanager/src/update_regional_secret_with_expiration.php:28, tag secretmanager_update_regional_secret_with_expiration
• secretmanager/src/update_secret_using_etag.php:28, tag secretmanager_update_secret_using_etag
• secretmanager/src/update_secret_with_expiration.php:28, tag secretmanager_update_secret_with_expiration

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[gemini-code-assist]

Summary of Changes

Hello @dhavalbhensdadiya-crest, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the Google Cloud Secret Manager PHP client samples by introducing a suite of new functionalities. It provides developers with clear examples for managing secret lifecycles through expiration settings, ensuring secure and efficient secret rotation. Furthermore, it demonstrates best practices for optimistic concurrency control using ETags across various secret and secret version operations, preventing conflicts in concurrent environments. The addition of filtered listing examples also improves the ability to query and manage secrets programmatically.

Highlights

• Secret Expiration Management: New samples have been added for creating, updating, and removing Time-To-Live (TTL) based expirations for both global and regional Google Cloud Secret Manager secrets.
• Optimistic Concurrency with ETags: A comprehensive set of samples demonstrating the use of ETags for optimistic concurrency control has been introduced. These cover operations such as deleting secrets, and destroying, disabling, enabling, or updating secret versions, for both global and regional secrets.
• Filtered Listing Capabilities: New samples are now available to list secrets and secret versions using filters, enhancing the discoverability and management of secrets within a project or location.
• Expanded Test Coverage: Corresponding unit tests have been added and updated in regionalsecretmanagerTest.php and secretmanagerTest.php to validate the functionality of all new samples, ensuring their reliability and correctness.

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[gemini-code-assist]

Code Review

This pull request introduces a valuable set of new samples for Secret Manager, covering secret expiration, etag-based optimistic concurrency, and filtering for both global and regional secrets. The code is well-structured and the new test cases provide good coverage. I've identified a few minor areas for improvement, mainly concerning output formatting in the CLI samples and adherence to PHP coding standards.