[TASK] Remove a useless WorkspaceService test

The test does not make sense and is skipped for a
while already. Remove it.

Resolves: #97112
Releases: main, 11.5
Change-Id: If00b0b607263531359393cff7793624a12b878bb
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76743


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>