Merge branch 'security-import-project-visibility-11-6' into 'security-11-6'
[11.6] Fix Imported Project Retains Prior Visibility Setting See merge request gitlab/gitlabhq!2853 (cherry picked from commit 348a5dbc905cac1d61158e9fb83b82185a27cb04) aaca3d2b Fix tree restorer visibility level 1d942ad1 Update schema file