Add test to ensure domain-neutral is working

[pjanotti]

Why

To ensure that domain-neutral instrumentation is not broke by unrelated changes.

It doesn't "fix" #1134 directly, however, after adding strong name support an assembly properly registered on the GAC can be loaded as domain-neutral for bytecode instrumentations. In light of that will close #1134 when this PR is merged.

What

Add a test to ensure domain-neutral bytecode instrumentation is working. Since domain-neutral depends on the assembly to be registered on the GAC and that requires strong name, the test is very similar to the strong name test recently added.

• Added a test to validate that domain-neutral is working. It requires GAC registration so it must be run as admin.
• Changed the target of the strong named validation to a test library so both strong name and domain-neutral can use a single instrumentation target.
• Add brackets to app domain name log statements in the native code since the names can contain white spaces.

Tests

Added a new test: DomainNeutralTests.

Checklist

- [ ] CHANGELOG.md is updated.
- [ ] Documentation is updated.
- [ ] New features are covered by tests.

[pjanotti]

Tracking via #1235

Test failure on windows-2022 on GraphQL: https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/actions/runs/3062009532/jobs/4942479088#step:4:3381

Another run, another failure on this test: https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/actions/runs/3062693118/jobs/4945192191#step:4:3382

Failure on attempt #6: https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/actions/runs/3062693118/jobs/4947320069#step:4:3382

[pjanotti]

🤔 Hum, the strong name test failed on this run: https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/actions/runs/3062693118/jobs/4943951142#step:4:3392

I may need to add some synchronization to ensure that the span is exported and received.

[Edit 09/16/22]: More failures of the same test, created #1242

[pjanotti]

Now Prometheus test failure https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/actions/runs/3062693118/jobs/4944488991#step:4:3384

Prometheus failure on 4th attempt: https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/actions/runs/3062693118/jobs/4945853127#step:4:3381