add support for mlflow in caliban shell

[ajslone]

This PR adds support for mlflow reporting via cloud_sql_proxy in caliban shell.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.90%. Comparing base (9062a7b) to head (1de728e).
⚠️ Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
caliban/docker/build.py	25.00%	3 Missing ⚠️
caliban/platform/run.py	0.00%	3 Missing ⚠️
caliban/platform/shell.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   51.83%   51.90%   +0.07%     
==========================================
  Files          31       31              
  Lines        3158     3169      +11     
==========================================
+ Hits         1637     1645       +8     
- Misses       1521     1524       +3     

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