feat(secretmanager): Adding delete secret annotation sample

[khilan-crest]

Adding samples for delete secret annotations

Fixes #

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Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

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[gemini-code-assist]

Summary of Changes

Hello @khilan-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 enhances the Google Cloud Secret Manager Go samples by adding new functionalities for managing secret annotations. It provides clear, executable examples for deleting annotations from both globally managed and regionally managed secrets, along with robust system tests to validate these operations. This update improves the utility of the sample library for developers needing to programmatically manage secret metadata.

Highlights

• New Sample: Delete Secret Annotation: Introduced a new Go sample (delete_secret_annotation.go) demonstrating how to delete an annotation from a Google Cloud Secret Manager secret. This involves fetching the secret, removing the specified annotation from its map, and then updating the secret with the modified annotations.
• New Regional Sample: Delete Regional Secret Annotation: Added a corresponding regional Go sample (delete_regional_secret_annotation.go) that illustrates the process of deleting an annotation from a regional Secret Manager secret. This sample explicitly configures the client to connect to a regional endpoint.
• Comprehensive Testing: New system tests (TestDeleteSecretAnnotation and TestDeleteRegionalSecretAnnotation) have been added to secretmanager_test.go and regional_secretmanager_test.go respectively, ensuring the correct functionality of both the global and regional delete annotation samples.

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[gemini-code-assist]

Code Review

This pull request adds new samples for deleting secret annotations in both global and regional contexts, along with corresponding tests. The implementation is straightforward and correct. I've provided a few suggestions to improve the new sample functions by making them more reusable and to enhance the tests by increasing their coverage to include failure scenarios.

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• secretmanager/delete_secret_annotation.go:17, tag secretmanager_delete_secret_annotation
• secretmanager/regional_samples/delete_regional_secret_annotation.go:17, tag secretmanager_delete_regional_secret_annotation

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