For selective reverting add DELETE auto-save endpoint

wim leers → credited larowlan → .

Looks like the right direction, but still a bit rough around the edges. With minimal effort we can avoid the need for follow-up issues. 🙏

This is very close, just a couple of minor adjustments needed

Addressed Wim and my review comments whilst its a public holiday in the US, this looks ready to go

📌 Add a Publish Experience Builder Content permission Postponed will need to update this to use the appropriate permissions.

✨ Implement OAuth2 authentication for API endpoints related to code components Active made it impossible to run this test locally without also installing simple_oauth, but CONTRIBUTING.md had not yet been updated. Missed that in review there 🙈 Fixing that here.

1. #3530497-4: [PP-1] Create UI for selective discarding of changes → is now less blocked.
2. #3529892-11: Add a Publish Experience Builder Content permission → now needs updating.
3. Created follow-up: 📌 [later phase] Generalize GET/PATCH/DELETE for individual auto-save entries: refactor `ApiConfigAutoSaveControllers` and `ApiAutoSaveController::delete()` Postponed .