Merge branch 'issue_393496' into 'master'

Validate date range on FlowMetrics API

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116558



Merged-by: Etienne Baqué <ebaque@gitlab.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Approved-by: Etienne Baqué <ebaque@gitlab.com>
Co-authored-by: Felipe Artur <felipefac@gmail.com>