[Rails5] Missing elements in spec/finders/snippets_finder_spec.rb

Note: add rails5 to a branch name to trigger rails5 specific CI jobs.

https://gitlab.com/gitlab-org/gitlab-ce/-/jobs/74545376

Failures:

  1) SnippetsFinder#execute returns project- and personal snippets
     Failure/Error: expect(finder.execute).to contain_exactly(project_snippet, personal_snippet)

       expected collection contained:  [#<ProjectSnippet id:75 namespace597/project639$75>, #<PersonalSnippet id:76 $76>]
       actual collection contained:    [#<PersonalSnippet id:76 $76>]
       the missing elements were:      [#<ProjectSnippet id:75 namespace597/project639$75>]
     # ./spec/finders/snippets_finder_spec.rb:173:in `block (3 levels) in <top (required)>'