fix: show live service versions in Grafana

[macterra]

Summary

• fix Grafana status panels to show the current live service version and commit instead of stale historical values
• remove hidden label_values(...) dashboard variables that could keep old version labels like v0.6.0
• make the affected status/version tiles use instant Prometheus queries with group_left(version, commit) so restart windows do not produce No data

Verification

• validated all updated dashboard JSON files with jq empty
• verified live Prometheus queries now return labels including version="0.7.0" and commit="7d3b24f"
• restarted Grafana and confirmed the panels render current values, for example v0.7.0 (7d3b24f) for Gatekeeper and Keymaster