[TASK] Remove bootstrap-slider library

This patch removes the bootstrap-slider library used to render input
sliders. Such elements have been replaced with HTML input fields using
`type="range"` which provides the same base functionality some time ago.

Since using bootstrap-slider with TYPO3 is neither documented nor
propagated, removing this library isn't considered as breaking change.

Resolves: #90897
Releases: master
Change-Id: I8516e2a4b98125e02873fad43c44cb2bc034e783
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64047


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Frank Nägler <frank.naegler@typo3.org>