[stable18] Reuse cache for directory mtime/size if filesystem changes can be ignored

[backportbot-nextcloud]

backport of #21728

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 31566: failure

mariadb10.4-php7.3

Show full log

There were 2 warnings:
1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static
2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static
--
There was 1 failure:
1) Test\SystemTag\SystemTagManagerTest::testUpdateTagDuplicate with data set #0 (array('one', true, true), array('two', true, true))
Failed asserting that exception of type "OCP\SystemTag\TagNotFoundException" matches expected exception "OCP\SystemTag\TagAlreadyExistsException". Message was: "Tag does not exist" at
/drone/src/lib/private/SystemTag/SystemTagManager.php:237
/drone/src/tests/lib/SystemTag/SystemTagManagerTest.php:383
.