[stable18] Fix detecting text/x-php mimetype and secure mimetype mapping

[backportbot-nextcloud]

backport of #22646

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 32881: failure

sqlite

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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

acceptance-app-files

• tests/acceptance/features/app-files.feature:108

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 Scenario: show shares # /drone/src/tests/acceptance/features/app-files.feature:108
Given I am logged in # LoginPageContext::iAmLoggedIn()
And I share the link for "welcome.txt" # FilesAppSharingContext::iShareTheLinkFor()
When I open the "Shares" section # AppNavigationContext::iOpenTheSection()
Then I see that the current section is "Shares" # AppNavigationContext::iSeeThatTheCurrentSectionIs()
Then I see that the file list contains a file named "welcome.txt" # FileListContext::iSeeThatTheFileListContainsAFileNamed()
Row for file welcome.txt in file list could not be found after 100 seconds (NoSuchElementException)