v2.0.655-mattr-rsb-otel-metrics

- [5610c02eeb1d0b7157a3ce4f9b4f5720810628bc](https://github.com/OctopusDeploy/teamcity-opentelemetry-plugin/commit/5610c02eeb1d0b7157a3ce4f9b4f5720810628bc) - Dont need a mock, we can just pass null