Repo Gardening > Check description: adjust wording and checks

The task currently runs a number of checks and outputs a message in a comment on each PR:

https://github.com/Automattic/jetpack/blob/b76a27c4f3700a310aad288833eeb7a6c3a496fc/projects/github-actions/repo-gardening/src/tasks/check-description/readme.md

There are 4 things we need to improve with this task:

```[tasklist]
### Tasks
- [ ] Make the wording of the comment clearer, that those things are **required** before you can proceed with merging the PR.
- [ ] Update the part about "Needs Review" and "Needs Team Review" ; it's outdated and still references Crew.
- [ ] We should take that opportunity to re-work the Status labels requirements. We may not always need a status label if we get rid of the "Needs team review" label for example.
- [ ] Improve the checks we run for testing instructions / privacy section: we need to do more than just check for the heading.
```

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Related references:
- p1740161892407389/1740155311.575309-slack-CDLH4C1UZ
- p1740158150216529/1740154130.612439-slack-CDLH4C1UZ
- p9dueE-8nS-p2#comment-10574
- pf4qpu-u1-p2