[TASK] Do not throw exception on unavailable APC(u) cache backend

Log an error (keeping the website available) instead of throwing an
exception (and thus completely disabling it) if TYPO3 is configured to
use the APC / APCu cache backend but saving data to the cache failed.

Resolves: #79636
Releases: master, 8.7

Change-Id: I3adf829825017a3061e921d5d3ec74f20e18311e
Reviewed-on: https://review.typo3.org/51521


Reviewed-by: Stephan Großberndt <stephan@grossberndt.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>