Refactor logging level conversion to use Monolog Level constants (#712)
* Refactor logging level conversion to use Monolog Level constants in LogAspect class
* Refactor logging level conversion to use Monolog Level constants in LogAspect class
* Refactor LogAspect to use Monolog Level constants
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Co-authored-by: Deeka Wong <8337659+huangdijia@users.noreply.github.com>