[stable18] Generate a new session id if the decrypting the session data fails

[backportbot-nextcloud]

backport of #24550

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 199: failure

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Show full log

There was 1 error:

1) OCA\Files_Sharing\Tests\ApiTest::testGetShareMultipleSharedFolder
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/ApiTest.php:813

--

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