[stable20] Dashboard: Fix accessibility skip links

[backportbot-nextcloud]

backport of #22925

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 33199: failure

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)

acceptance-header

• tests/acceptance/features/header.feature:31

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  Scenario: users from other groups are not seen in the contacts menu when autocompletion is restricted within the same group # /drone/src/tests/acceptance/features/header.feature:31
    Given I am logged in as the admin                                                                                         # LoginPageContext::iAmLoggedInAsTheAdmin()
    And I visit the settings page                                                                                             # SettingsMenuContext::iVisitTheSettingsPage()
    And I open the "Sharing" section of the "Administration" group                                                            # AppNavigationContext::iOpenTheSectionOf()
    And I enable restricting username autocompletion to groups                                                                # SettingsContext::iEnableRestrictingUsernameAutocompletionToGroups()
    And I see that username autocompletion is restricted to groups                                                            # SettingsContext::iSeeThatUsernameAutocompletionIsRestrictedToGroups()
    When I open the Contacts menu                                                                                             # ContactsMenuContext::iOpenTheContactsMenu()
    Then I see that the Contacts menu is shown                                                                                # ContactsMenuContext::iSeeThatTheContactsMenuIsShown()
    And I see that the contact "user0" in the Contacts menu is not shown                                                      # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsNotShown()
      Failed asserting that true is false.
    And I see that the contact "admin" in the Contacts menu is not shown                                                      # ContactsMenuContext::iSeeThatTheContactInTheContactsMenuIsNotShown()