[Feature Request] Logging statements are not present in log output

Describe the bug

When emitting logging statements within a flow in prompt flow, they do not appear in the log output.

How To Reproduce the bug Steps to reproduce the behavior, how frequent can you experience the bug:

1. In a Python node, emit a log using:
   • logger = logging.getLogger(__name__)
   • logger.warn("log statement")
2. "log statement" should show up in the log output when running a flow

Expected behavior

"log statement" should show up in the log output when running a flow (and with that also in logs.txt).

Running Information(please complete the following information):

• Promptflow Package Version using 1.4.1
• Operating System: WSL on Windows 11
• Python Version using Python (Linux) 3.9.18