[UAP] Fix UAP Windows unit test flake

[XuechunHou]

Description

windowsEventLogger.Close() is called within the cancel function when either of the two sub-agent processes exits. These sub-agent processes are spawned as separate goroutines. The cancel function logs any error messages before calling Close() on the Windows event logger. The crash occurs when one subprocess exits and closes the eventLogger while the other subprocess is still attempting to access it to log errors.

The fix to it is to handle windows event logger creation and closing inside main.go function. The entire UAP plugin is essentially an RPC server, the windows event logger is now created before the server starts listening for requests (blocking), and closed when server stops serving.

Related issue

b/465497407

How has this been tested?

UAP windows unit tests should not flake anymore

Checklist:

• Unit tests
  • Unit tests do not apply.
  • Unit tests have been added/modified and passed for this PR.
• Integration tests
  • Integration tests do not apply.
  • Integration tests have been added/modified and passed for this PR.
• Documentation
  • This PR introduces no user visible changes.
  • This PR introduces user visible changes and the corresponding documentation change has been made.
• Minor version bump
  • This PR introduces no new features.
  • This PR introduces new features, and there is a separate PR to bump the minor version since the last release already.
  • This PR bumps the version.