[CLEANUP] Remove obsolete fixtures of Fluid unit tests

Change-Id: I8a54c72090fc9e9d39fae1ddd13d8f72f691fcc0
Resolves: #83929
Related: #82414
Related: #79972
Related: #77127
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/55744


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>