Merge branch 'uninstrument-banzai-reference-extractor' into 'master'

Un-instrument Banzai::ReferenceExtractor

No changelog entry since this isn't really something new compared to 8.6, instead it adjusts something that was added for 8.7.

See merge request !3676

config/initializers/metrics.rb

@@ -85,9 +85,6 @@ if Gitlab::Metrics.enabled?
       config.instrument_instance_methods(const)
     end
-    config.instrument_methods(Banzai::ReferenceExtractor)
-    config.instrument_instance_methods(Banzai::ReferenceExtractor)
-
     config.instrument_methods(Banzai::Renderer)
     config.instrument_methods(Banzai::Querying)