[BUGFIX] Respect $evaluatePermissions and multiple filemounts

The check for filemounts with the read_only flag in
\TYPO3\CMS\Core\Resource\ResourceStorage now respects the
$evaluatePermissions setting and also takes other non
read-only filemounts into account when evaluating the
permissions.

Resolves: #63364
Releases: master, 6.2
Change-Id: If90958b7d6e4d5aad1fbd172af06462ca2b9764f