Test coverage: add integration test using ReadyToRun/NGEN

[pjanotti]

[EDIT: update to clarify that this is about ReadyToRun not AOT]

The code requesting ReJIT of methods targeted for bytecode instrumentation is missing coverage in the following cases:

1. Instrumenting a method from a module that was NGENed/ReadyToRun;
2. Instrumenting a method that was inlined;
3. Instrumenting a method that was inlined and is used by a module that was NGENed;

[Kielek]

SIG meeting notes:
Create test similar to StrongNamedAssembly.
Our testapp/testlibrary should include method marked as forced inlining. Our bytecode instrumentation should include instrumentation for it (remember about json definition). Then we should cover everything by tests.

[Kielek]

Ref: open-telemetry/opentelemetry-dotnet#3429