[BUGFIX] Hide mass action selector when empty

In the workspaces module, hide the mass action selector when no actions
are available. In particular, this is the case when
options.workspaces.enableMassActions = 0 has been set in User TSconfig.

Releases: master
Resolves: #95295
Change-Id: I81b5aa62ec5496b37dc70f042e4e3d779d84f874
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/71165


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>