* Prometheus: fix rate_interval to use min step properly

* Update docs/sources/features/datasources/prometheus.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Simplify `getRateIntervalScopedVariable` (#27174)

Signed-off-by: beorn7 <beorn@grafana.com>

* Modify rate_interval tests to use createQuery

* Change test wording + intervalfactor

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>
Co-authored-by: Björn Rabenstein <beorn@grafana.com>