Remove unused Admin::ProjectsFinder after Admin projects list migration

Hemang Brequested to merge
gitlab-community/gitlab-org/gitlab:delete-adminprojectfinder into master

What does this MR do and why?

This MR removes the unused Admin::ProjectsFinder class and its associated spec file from the codebase.

Removed files:

  • app/finders/admin/projects_finder.rb
  • spec/finders/admin/projects_finder_spec.rb

References

Closes #549932

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