Muzzle should recognise mismatch on unimplemented abstract methods at runtime

[mateuszrzeszutek]

Fixes #1337

It turns out that REFERENCE_CREATION_PACKAGE value at runtime was completely different than at compile time: relocate changed the strings it was not supposed to change - see exclude below:

  // rewrite library instrumentation dependencies
  relocate("io.opentelemetry.instrumentation", "io.opentelemetry.javaagent.shaded.instrumentation") {
    exclude "io.opentelemetry.instrumentation.auto.**"
  }

Thanks @pavolloffay for the repro steps!

[trask]

Thanks @pavolloffay @mateuszrzeszutek!

I created #1364 to add an integration test for this tricky behavior sometime in the future

[pavolloffay]

thanks @mateuszrzeszutek for looking into this 👍