Build/Test Tools: Add more workflow file linting with Zizmor.

This change introduces Zizmor, which is a tool for linting GitHub Actions workflow files for security weaknesses. This compliments the existing Actionlint scanning.

For more information about Actionlint and Zizmor, see the GitHub Actions Workflow Standards page in the developer handbook: https://developer.wordpress.org/coding-standards/wordpress-coding-standards/github-actions/

Some issues in workflow files that are reported by Zizmor will be addressed in follow-up commits.

Props johnbillion, desrosj.

See #64227


git-svn-id: https://develop.svn.wordpress.org/trunk@62250 602fd350-edb4-49c9-b593-d223f7449a82