When creating Grafana-managed alerts from Prometheus rule definitions with mimirtool or cortextool, the rules are marked as "provisioned" and are not editable in the Grafana UI. This PR allows changing this by providing an extra header: --extra-header="X-Disable-Provenance=true".
When provenance is disabled, we do not keep the original rule definition in YAML, so it is impossible to read it back using the Prometheus conversion API (mimirtool/cortextool). This is intentional because if we did keep it and the rule was later changed in the UI, its Prometheus YAML definition would no longer reflect the latest version of the alert rule, as it would be unchanged.
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