Merge branch '425048-remove-visualization-editor-flag' into 'master'

Remove analytics visualization editor feature flag

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/137774



Merged-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Tarun Vellishetty <tvellishetty@gitlab.com>
Approved-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Elwyn Benson <ebenson@gitlab.com>
Co-authored-by: Jiaan Louw <jlouw@gitlab.com>