[stable17] Ensured large image is unloaded from memory when generating previews

[backportbot-nextcloud]

⚠️ This backport had conflicts and is incomplete ⚠️

backport of #22008

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 31611: failure

webpack-build

• I'm a little sad 🤖 and was not able to find the logs for this failed job - please improve me at https://github.com/MorrisJobke/drone-logs to provide this to you

nodb

• I'm a little sad 🤖 and was not able to find the logs for this failed job - please improve me at https://github.com/MorrisJobke/drone-logs to provide this to you

postgres9-php7.3

Show full log

There was 1 failure:

1) OCA\Files_Versions\Tests\VersioningTest::testRestoreMovedShare
File content has not changed
Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'version 2'
+'version 1'

/drone/src/apps/files_versions/tests/VersioningTest.php:725

[MorrisJobke]

This was only added to stable19: #19495