[stable19] [CalDAV] Validate notified emails

[backportbot-nextcloud]

⚠️ This backport had conflicts and is incomplete ⚠️

backport of #25310

[nickvergessen]

@tcitworld the backport didn't work completly, can you check?

[tcitworld]

Should be fine now.

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 1694: failure

mariadb10.4-php7.3

Show full log

There was 1 error:

1) OCA\FederatedFileSharing\Tests\FederatedShareProviderTest::testCreate
OCP\Share\Exceptions\ShareNotFound: There was an error retrieving the share. Maybe the link is wrong, it was unshared, or it was deleted.

/drone/src/apps/federatedfilesharing/lib/FederatedShareProvider.php:863
/drone/src/apps/federatedfilesharing/lib/FederatedShareProvider.php:242
/drone/src/apps/federatedfilesharing/tests/FederatedShareProviderTest.php:187

--

There were 3 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

3) OCA\Files_Sharing\Tests\External\ManagerTest::testAddShare
Cannot stub or mock class or interface "OCA\Files_Sharing\Tests\External\IManager" which does not exist