Update workflows with correct permissions and secrets.

[jouillet]

PR Description

• Update workflows with correct permissions and secrets.
• Update workflows to use commit IDs to reference actions.

Changes

• Update pre-merge workflow to use commit IDs and correct permissions
• Update post-merge workflow to use commit IDs, correct permissions, and secrets
• Update publish-docs workflow to use commit IDs, correct permissions, and disable simple_mode
• Update labeler workflow to use commit IDs and limited permissions (per recommendations)

Additional Information

Include any additional information, such as how to test your changes.

Checklist

• Tests passed
• Documentation updated