Surface API errors to the user, fix race conditions, tag edits and more

This can be broken out into more MRs if needed. Changes include:

• WishlistIntake: API errors are shown to the user ( T369764). For this, the design uses the standard Message component. It is still subject to design review but can be addressed later.
• Fix edit conflict resolution by using the timestamp of when the wish content was fetched.
• DescriptionSection: Fix race condition in loading DescriptionField. This was a bug only discoverable by Selenium!
• Tag edits with community-wishlist. This will be useful for AbuseFilters and monitoring in general.
  • IMPORTANT: You must manually create the community-wishlist tag at Special:Tags on your wiki. npm run setup will handle the rest.
• DescriptionField: remove some dead code (syncCallback)
• WishlistIntake: refactor code out of handleSubmit()
• WishlistIntake: change getUniquePageTitle() to start the first duplicate with a suffix of 2 and instead of 1.
• WishlistIntake: move allowCloseWindow.release() to be after the edit was successfully made. Without this, one might accidentally close the tab and lose their work after a failed save.
• Fix issue with CI not knowing about credentials.json
• Add a few JSDoc blocks.

Bug: T369764