Remote resolver (microsoft#21332)

This is branch will serve as a feature branch for all changes related to
switching to the remote resolver.
This will include
- switching from using the testAdapter to parse the return data to now
using this new class resultResolver
- adding tests for all testAdapters, fixing for server and adding for
resultResolver
- moving sendCommand to a new file, out of the server, and getting
pytest to adopt it
- moving the server which send the test IDs to a new file and adopt it
for both pytest and unittest
- write tests for these two new files.

Author: eleanorjboyd

src/client/testing/testController/common/resultResolver.ts

@@ -229,5 +229,3 @@ export class PythonResultResolver implements ITestResultResolver {
         return Promise.resolve();
     }
 }
-
-// had to switch the order of the original parameter since required param cannot follow optional.