[stable19] Clear cached app config while waiting for the SCSSCache lock to return

[backportbot-nextcloud]

backport of #23478

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 34280: failure

mysql8.0-php7.2

Show full log

There was 1 error:

1) OCA\OAuth2\Tests\Db\ClientMapperTest::testGetByUid
OCA\OAuth2\Exceptions\ClientNotFoundException: could not find client with id 0

/drone/src/apps/oauth2/lib/Db/ClientMapper.php:81
/drone/src/apps/oauth2/tests/Db/ClientMapperTest.php:69

Caused by
OCP\AppFramework\Db\DoesNotExistException: Did expect one result but found none when executing: query "SELECT * FROM `*PREFIX*oauth2_clients` WHERE `id` = :dcValue1"; 

/drone/src/lib/public/AppFramework/Db/QBMapper.php:273
/drone/src/lib/public/AppFramework/Db/QBMapper.php:349
/drone/src/apps/oauth2/lib/Db/ClientMapper.php:79
/drone/src/apps/oauth2/tests/Db/ClientMapperTest.php:69

--

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