Razor PR Integration Tests

[ryanbrandenburg]

Create Integration Tests for razor-tooling pr's.

• [x] Create first pass of tests
• [x] Ensure logs are captured on failure.
• [x] Run on VS Main builds

To come later:

• [ ] #5953
• [ ] #5954
• [x] #5955
• [x] #5956
• [x] #5957
• [ ] #5958
• [ ] #5959
• [ ] #5960
• [x] #5966
• [ ] #6051
• [ ] #6066

[ryanbrandenburg]

For the tests to be added later we can start by porting the behavior from Microsoft.Test.Apex.Razor in the VS repo. That may still involve some significant work because a lot of the convenience APIs from that framework don't exist in https://github.com/microsoft/vs-extension-testing yet, and the recommended ways of "waiting for ready" in the two frameworks are different.

[ryanbrandenburg]

Talked with @JoeRobich offline, Roslyn runs on VS Main here. We're not currently allowed to turn that on in an automated way, but I can start working on it with manual tests then follow up with some level of automation once the current issues resolve.

[ryanbrandenburg]

I've got the Tests running against VS Main now, just need to put them on a schedule, build against each commit in razor/tooling:main and hopefully make sure they're the only tests that run so we don't was CPU/build time.

[allisonchou]

@ryzngard We assigned this issue to you during planning, the intention is to just take one of the sub-issues though.