feat(secretmanager): Add samples for labels and annotations in Secret Manager

[durgesh-ninave-crest]

Description

Created samples for Global and Regional Secret Manager API

Samples (Global, Regional)

1. Create Secret With Labels
2. Create Secret With Annotations
3. Edit Secret Labels
4. Edit Secret Annotations
5. Delete Secret Label
6. Delete Secret Annotation
7. View Secret Labels
8. View Secret Annotations

Checklist

• I have followed guidelines from the CONTRIBUTING.MD
• Appropriate changes to README are included in PR
• Test passed: ../testing/vendor/bin/phpunit test/ -v
• Lint passed: php-cs-fixer fix . --config .php-cs-fixer.dist.php
• These samples need a new API enabled in testing projects to pass (let us know which ones)

Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 16 region tags.

• secretmanager/src/create_regional_secret_with_annotations.php:28, tag secretmanager_create_regional_secret_with_annotations
• secretmanager/src/create_regional_secret_with_labels.php:28, tag secretmanager_create_regional_secret_with_labels
• secretmanager/src/create_secret_with_annotations.php:28, tag secretmanager_create_secret_with_annotations
• secretmanager/src/create_secret_with_labels.php:28, tag secretmanager_create_secret_with_labels
• secretmanager/src/delete_regional_secret_annotation.php:28, tag secretmanager_delete_regional_secret_annotation
• secretmanager/src/delete_regional_secret_label.php:28, tag secretmanager_delete_regional_secret_label
• secretmanager/src/delete_secret_annotation.php:28, tag secretmanager_delete_secret_annotation
• secretmanager/src/delete_secret_label.php:28, tag secretmanager_delete_secret_label
• secretmanager/src/edit_regional_secret_annotations.php:28, tag secretmanager_edit_regional_secret_annotations
• secretmanager/src/edit_regional_secret_labels.php:28, tag secretmanager_edit_regional_secret_labels
• secretmanager/src/edit_secret_annotations.php:28, tag secretmanager_edit_secret_annotations
• secretmanager/src/edit_secret_labels.php:28, tag secretmanager_edit_secret_labels
• secretmanager/src/view_regional_secret_annotations.php:28, tag secretmanager_view_regional_secret_annotations
• secretmanager/src/view_regional_secret_labels.php:28, tag secretmanager_view_regional_secret_labels
• secretmanager/src/view_secret_annotations.php:28, tag secretmanager_view_secret_annotations
• secretmanager/src/view_secret_labels.php:28, tag secretmanager_view_secret_labels

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[bshaffer]

I ran the tests and they passed! Great job!