refactor(@schematics/angular): add trailing commas to generated direc…

[MeAkib]

…tive, pipe, and guard files

Enforces consistent code formatting in generated artifacts by adding trailing commas to class metadata and other relevant object literals in directives, pipes, and guards.

PR Checklist

Please check to confirm your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular-cli/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[clydin]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 3b536d9
• 21.0.x: 026a9c1

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