test: add tests around the logger experience of bolt

[WilliamBergamin]

Summary

This PR aims to add tests around the behavior of loggers used between Bolt and WebClient

This is the first step to solve #1255

Testing

Run the unit tests

Category

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Document pages under /docs
• Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[zimeg]

LGTM! These are great cases to be covering 🙏

AFAICT this confirms the same logger is used for both the Bolt and WebClient instance, as is, but doesn't change how the logger might be shared in logic?

The linked issue's case isn't so obvious in these tests, but as a first step I'm a fan of these tests 🧪 🔍

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.96%. Comparing base (4185608) to head (8820dde).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1270      +/-   ##
==========================================
+ Coverage   90.94%   90.96%   +0.01%     
==========================================
  Files         222      222              
  Lines        7501     7501              
==========================================
+ Hits         6822     6823       +1     
+ Misses        679      678       -1     

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