Merge branch '511780-feature-flag-delete-confirmation-input-label' into 'master'

Add label to feature flag instance ID regeneration input

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179087



Merged-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Approved-by: Phillip Wells <pwells@gitlab.com>
Approved-by: Doug Stull <dstull@gitlab.com>
Approved-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Reviewed-by: Doug Stull <dstull@gitlab.com>
Co-authored-by: danmh <dmizzi-harris@gitlab.com>