Merge branch '432778-feature-flag-default-enable' into 'master'

Default enable `group_level_vulnerability_report_grouping` feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157949



Merged-by: Brian Williams <bwilliams@gitlab.com>
Approved-by: Michael Becker <11881043-wandering_person@users.noreply.gitlab.com>
Approved-by: Brian Williams <bwilliams@gitlab.com>
Co-authored-by: Bala Kumar <sbalakumar@gitlab.com>

config/feature_flags/development/group_level_vulnerability_report_grouping.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/432778
 milestone: '16.7'
 type: development
 group: group::threat insights
-default_enabled: false
+default_enabled: true