[stable18] Add app config option to disable "Email was changed by admin" activity

[MorrisJobke]

Backport of #22217

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 31753: failure

jsunit

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PhantomJS 2.1.1 (Linux 0.0.0) LOG: 'JQMIGRATE: Migrate is installed, version 1.4.1'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Files.Sidebar initialized'
PhantomJS 2.1.1 (Linux 0.0.0) WARN: 'Proxying an event bus of version 1.1.2 with 0.2.1'
PhantomJS 2.1.1 (Linux 0.0.0) WARN: 'Proxying an event bus of version 1.1.2 with 0.2.1'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Sharing.ShareSearch initialized'
PhantomJS 2.1.1 (Linux 0.0.0) DEBUG: 'OCA.Sharing.ExternalLinkActions initialized'
PhantomJS 2.1.1 (Linux 0.0.0): Executed 847 of 851 (skipped 4) SUCCESS (12.164 secs / 11.374 secs)

mariadb10.4-php7.3

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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

--

There was 1 failure:

1) Test\Files\Storage\Wrapper\PermissionsMaskTest::testScanUnchangedWrapped
Failed asserting that true is false.

/drone/src/tests/lib/Files/Storage/Wrapper/PermissionsMaskTest.php:177

mysql8.0-php7.2

• cancelled - typically means that the tests took longer than the drone CI allows them to run

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)