NEXT-27720 - Fix missing user avatar media

[akf-bw]

1. Why is this change necessary?

• Currently the administration user can upload a avatar media for himself, but because of multiple missing associations the avatar never really shows up correctly
• This PR fixes the avatar media by adding multiple missing associations to
  • The administration sidebar footer
  • The administration profile edit page
  • The administration User & Groups listing page
  • The administration User & Groups detail page

2. What does this change do, exactly?

• Changed UserController to add the missing avatarMedia association
• Changed sw-profile-index to load the missing user avatar on page load
• Changed sw-users-permissions-user-listing to add the missing avatarMedia association
• Changed sw-users-permissions-user-detail to load the missing user avatar on page load & provide media modal methods
• Changed sw-users-permissions-user-detail twig template to include media modal content

3. Describe each step to reproduce the issue or behaviour.

• Open the administration with a user who has a avatar media set
• See that the media does not show up correctly in multiple places

4. Please link to the relevant issues (if any).

• Fix NEXT-27720

5. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfil them.

[shopware-github-importer]

Hello,

thank you for creating this pull request.
I have opened an issue on our Issue Tracker for you. See the issue link: https://issues.shopware.com/issues/NEXT-27720

Please use this issue to track the state of your pull request.