feat: upstream mocha instrumentation testing plugin from ext-js (@blu…

…mamir) open-telemetry#621 (open-telemetry#670)

Co-Authored-By: Amir Blum [email protected]

packages/opentelemetry-test-utils/README.md

@@ -1,6 +1,7 @@
 # Test Utils for OpenTelemetry contrib packages
 
-This is a internal utils package used across the contrib packages. No guarantees are given to uses outside of [open-telemetry/opentelemetry-js-contrib](https://github.com/open-telemetry/opentelemetry-js-contrib/) repository.
+This is a internal utils package used across the contrib packages.
+No guarantees are given to uses outside of [open-telemetry/opentelemetry-js-contrib](https://github.com/open-telemetry/opentelemetry-js-contrib/) repository.
 
 ## Instrumentation Testing
 This package exports a mocha [root hook plugin](https://mochajs.org/#root-hook-plugins), which implements common boilerplate code a developer probably needs for writing instrumentation unit tests in node.