Restrict double call migration with button loader

[yurabakhtin]

What kind of change does this PR introduce? (check at least one)

• Bugfix

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch if no hotfix
• All tests are passing
• Changelog was modified

Other information:
https://github.com/humhub/humhub-internal/issues/246#issuecomment-2104795918

[what-the-diff]

PR Summary

• Enhanced Usability of Certain Links
  The links for "Rebuild Search Index", "Update Database", and "Refresh" have been improved. Previously they were basic text links, but now they have been changed to primary action buttons, so they're more noticeable and user-friendly.

• Applied Design Consistency
  These buttons - "Rebuild Search Index", "Update Database", and "Refresh", for consistency and better design alignment, have been positioned to the right. This gives a more uniform look and assists users in navigating through the application.