docs: update consul keywords for discoverability (#21787)

* :wrench: config(consul-autopilot-m): consul autopilot monitoring discove Why: - Consul autopilot monitoring is fully implemented and documented across collector code, metadata, alerts, and health guides - The documentation gap is solely a discoverability issue: 'autopilot' keyword is missing from metadata.yaml keywords list - Previous search failure was caused by invalid RGrep path, not missing documentation What: - Add 'autopilot' keyword to netdata/src/go/plugin/go.d/collector/consul/metadata.yaml keywords list (lines 19-22) - Optional: Add 'operator' keyword to improve discoverability of Consul operator-level monitoring features - No regeneration needed - metadata.yaml is the source file for generated integration docs * Remove 'operator' keyword from metadata.yaml Removed 'operator' from the keywords list in metadata.yaml.