Passing the default logging file into flag pre-population causes the logger to assume the flag is always passed in and never falls back to the ENV setting. This ensures that if no flag is provided, the env log file setting is used.
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#### Does this PR need a docs update or release note?
- [x] ✅ Yes, it's included
#### Type of change
- [x] 🐛 Bugfix
#### Test Plan
- [x] 💪 Manual
- [x] ⚡ Unit test
- [x] 💚 E2E
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