ci: Try add codecov for flotilla

[colin-ho]

Changes Made

Related Issues

Checklist

• Documented in API Docs (if applicable)
• Documented in User Guide (if applicable)
• If adding a new documentation page, doc is added to docs/mkdocs.yml navigation
• Documentation builds and is formatted properly

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.19%. Comparing base (219d4c6) to head (8269861).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
daft/runners/flotilla.py	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5434      +/-   ##
==========================================
- Coverage   71.45%   71.19%   -0.26%     
==========================================
  Files        1001     1001              
  Lines      126760   126923     +163     
==========================================
- Hits        90579    90366     -213     
- Misses      36181    36557     +376     

Files with missing lines	Coverage Δ
daft/__init__.py	100.00% <ø> (+77.27%)	⬆️
daft/runners/flotilla.py	83.00% <78.57%> (+36.24%)	⬆️

... and 31 files with indirect coverage changes

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