feat(windows-agent): Add Windows Event Logger support

[ashuntu]

This changes the default logging method from file logging to using the Windows Event Logger. File logging is still available through the use of the new --file-log-enabled flag (and its accompanying --event-log-enabled flag, which is enabled by default).

You can view logs on Windows 11 by searching for the Event Viewer application and creating a Custom View for all event levels of the "Application" logs.

The eventlog support from Golang doesn't seem to include a debug function, so all debug logs are rerouted as info-level logs in the event viewer. In addition, there are event IDs which essentially go unused in this use case (0) as I believe they're mostly OS-specific event types and would be hard to utilize through the logging methods we're currently using.

---

UDENG-2323

[codecov]

Codecov Report

❌ Patch coverage is 43.85965% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.38%. Comparing base (56e1917) to head (0a69561).
⚠️ Report is 1912 commits behind head on main.

Files with missing lines	Patch %	Lines
windows-agent/cmd/ubuntu-pro-agent/agent/agent.go	42.22%	23 Missing and 3 partials ⚠️
windows-agent/cmd/ubuntu-pro-agent/agent/config.go	50.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #764      +/-   ##
==========================================
- Coverage   89.11%   87.38%   -1.73%     
==========================================
  Files         100      100              
  Lines        5519     6530    +1011     
==========================================
+ Hits         4918     5706     +788     
- Misses        426      642     +216     
- Partials      175      182       +7     

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