feat(secretmanager): add samples for secret annotations and regional labels

[vipul7499]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• 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 pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow 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

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• secret-manager/createSecretWithAnnotations.js:18, tag secretmanager_create_secret_with_annotations
• secret-manager/editSecretAnnotations.js:18, tag secretmanager_edit_secret_annotations
• secret-manager/regional_samples/createRegionalSecretWithLabels.js:18, tag secretmanager_create_regional_secret_with_labels
• secret-manager/regional_samples/deleteRegionalSecretLabel.js:18, tag secretmanager_delete_regional_secret_label
• secret-manager/regional_samples/editRegionalSecretLabel.js:18, tag secretmanager_edit_regional_secret_label
• secret-manager/regional_samples/viewRegionalSecretLabels.js:18, tag secretmanager_view_regional_secret_labels
• secret-manager/viewSecretAnnotations.js:18, tag secretmanager_view_secret_annotations

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