Fix code-format and test invocation through PowerShell

[ianjoneill]

Fixes the Invoke-CodeFormat and Invoke-OpenConsoleTests functions in OpenConsole.psm1 so that they can be run directly from PowerShell.

Addresses the issues found when creating #10447.

Invoke-CodeFormat did not work when invoked directly from PowerShell due to a relative path being passed into the .NET function [IO.File]::WriteAllLines(). The working directory for .NET objects does not change when you change directory in PowerShell, so the paths were being treated as relative to the initial working directory of the shell - which was not the terminal git repo.

Invoke-OpenConsoleTests had 3 issues:

1. The path to TestHostApp was wrong.
2. It would attempt to run the "in host app" tests both in the host app and not in the host app.
3. The test configuration in tests.xml wasn't in sync with the runABC.cmd files, so the remoting and control unit tests didn't run.

Validation Steps Performed

1. Ran Invoke-CodeFormat and runformat.cmd from multiple directories and didn't see errors.
2. Ran Invoke-OpenConsoleTests and didn't see errors.

[DHowett]

Thanks for this!

[DHowett]

Note for second reviewer: Manually merge (please update commit body to match PR body when you do!) because this will not run CI.