Fix UT in internal build pipeline

[ZhidongPeng]

After enable the cargo test failure at build.cmd, our internal build pipeline starts to fail. Copilot tells me some of the fields that may not exist in classic event log entries （written via ReportEventW）.

test etw::etw_writter::tests::write_event_log_test ... Verifying event log for source: Azure_GuestProxyAgent_TestApplication

thread 'etw::etw_writter::tests::write_event_log_test' (8380) panicked at proxy_agent_shared\src\etw\etw_writter.rs:187:22:
called `Result::unwrap()` on an `Err` value: Io(Custom { kind: InvalidData, error: "Failed to parse event XML: Custom: missing field `Version`" })
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
FAILED