Deprecate ::assertWaitOnAjaxRequest() in favour of ::assertExpectedAjaxRequest()

Replace assertWaitOnAjaxRequest with assertExpectedAjaxRequest
and add the deprecation warning in assertWaitOnAjaxRequest method.
Please review.

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The changes look mostly fine. This actually requires 📌 Stabilize FunctionalJavascript testing AJAX: add ::assertExpectedAjaxRequest() Fixed to land first, I should have marked it postponed on that and doing so now.

For the new deprecation, it should be from 10.2.0 instead of 10.1.0

I'm Nafis at DrupalCon Atlanta. I plan on working on this issue for the rest of the day.

nafisb → changed the visibility of the branch 3401619-deprecate-assertwaitonajaxrequest-rebased to hidden.

nafisb → changed the visibility of the branch 3401619-deprecate-assertwaitonajaxrequest-rebased to active.

Hi, I've created a new clean branch to address this issue.

The previous branch had too many unrelated commits and was outdated, causing multiple conflicts and making it hard to review.
This new branch includes only the intended change: replacing all usages of the deprecated assertWaitOnAjaxRequest() with assertExpectedAjaxRequest() across the core/ directory.

A new merge request has been opened from this clean branch.

Could someone please review and test this updated MR !12108?
Thank you!

smustgrave → closed merge request !11663

Ticket talks about deprecating a method but don't see the deprecation