Merge branch 'ld-slack-app-fix-disabled' into 'master'

Fix GitLab for Slack app disabled when uninstalled

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144544



Merged-by: Tiger Watson <twatson@gitlab.com>
Approved-by: George Koltsov <gkoltsov@gitlab.com>
Approved-by: Ethan Urie <eurie@gitlab.com>
Approved-by: Tiger Watson <twatson@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Co-authored-by: Luke Duncalfe <lduncalfe@eml.cc>