GitHub Actions updates and improvements for 7.2

[desrosj]

This ticket is for various updates and improvements for Core's GitHub Actions workflows.

Previously:

• 7.1 (#64893)
• 7.0 (#64227)
• 6.9 (#63170)
• 6.8 (#62221)
• 6.7 (#61564)
• 6.6 (#60733)
• 6.5 (#59805)
• 6.4 (#58867)
• 6.3 (#57865)
• 6.2 (#57572)

This expands the conditional checks attached to GitHub Actions workflow jobs to further limit when pull_request events spawn workflow runs within forks and private mirrors.

When the repository is not WordPress/wordpress-develop, the workflow now must be triggered by a pull request that is marked ready for review for all private repositories.

In case someone wishes to run workflows in a draft PR, the Draft Workflow Runs label could be added to the pull request and all future workflows will run.

Trac ticket: Core-65845.

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code

Used for creating the initial PR. All changes were manually reviewed by me.

With performing 7.1 branching targeted for today, I'm going to wait until after that occurs to commit this. I've changed the Trac ticket reference in the PR description accordingly.