GHA run integration tests on Linux

[tehbio]

• New workflow step for running the integration tests on Linux.
• Leverage run-on-arch GHA (https://github.com/uraimo/run-on-arch-action)
  • aarch64
  • ubuntu16.04
• Tests should be all that make sense (e.g. no Framework tests).
• Focus on asp.net core, limit to one test project if helpful.

[nr-ahemsath]

Some progress updates:

(Internal) GDoc tracking details of progress and TODOs: https://docs.google.com/document/d/1-mJNrcuMaT64cLXdBKhHco9JdKMCvMdHnclErQ1f-uI/edit

PR #752 was merged into the arm64 feature branch and lays the groundwork for running integration tests on Linux.
This branch has ongoing work to enable the tests that use an AspNetCore web app as the test application, through use of named pipes for IPC (as an alternative to named EventWaitHandles as used previously): https://github.com/newrelic/newrelic-dotnet-agent/tree/use-named-pipes-for-test-app-ipc

[nr-ahemsath]

As of PRs #766, #767 and #768 this is completed. Closing.