This will fix timestamps on logs and show all `VLOG(2)` logs on tests by default.
Currently, timestamps on logs are shown as -
```
I0000 00:00:1724385276.681936 1894892 config.cc:262] gRPC experiments enabled: call_tracer_in_transport, event_engine_dns, event_engine_listener, monitoring_experiment, pick_first_new, trace_record_callops, work_serializer_clears_time_cache
```
After invoking `absl::InitializeLog()`, this gets fixed to -
```
I0823 03:55:53.993928 1895644 config.cc:262] gRPC experiments enabled: call_tracer_in_transport, event_engine_dns, event_engine_listener, monitoring_experiment, pick_first_new, trace_record_callops, work_serializer_clears_time_cache
```
Closes#37560
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/37560 from yashykt:ImproveLoggingForTests 66433336c8
PiperOrigin-RevId: 666956421