[TASK] Use JQuery shipped with the core

Use JQuery which can be loaded in the Backend Container ViewHelper.

Releases: 2.1
Resolves: #59727
Change-Id: I65fd8bea4636a4ad8c74d5d17764960fc5c9ebac
Merge commit 'refs/changes/39/30939/1' of ssh://review.typo3.org:29418/TYPO3CMS/Extensions/powermail into 2.1