[stable18] add mount point to quota warning message

[MorrisJobke]

backport of #22913, #23193 and #23606

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 35450: failure

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There was 1 error:

1) OCA\Files_Sharing\Tests\EtagPropagationTest::testRecipientDeleteInShare
Error: Call to a member function getMountPoint() on null

/drone/src/lib/private/Share20/Manager.php:305
/drone/src/lib/private/Share20/Manager.php:707
/drone/src/apps/files_sharing/tests/EtagPropagationTest.php:142
/drone/src/apps/files_sharing/tests/PropagationTestCase.php:42

--

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