fix: Install debugpy in container instead of adding it

[tpoliaw]

Running uv add debugpy in the container modifies pyproject.toml and
uv.lock so git describe reports local changes in the repo and appends
a dev0+g<commit>.d<date> suffix to the version used for the blueapi in
the container

Using uv pip install debugpy makes it available in the environment
without modifying any tracked files.

This has to be run after the uv sync to stop it being removed again.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.30%. Comparing base (8820bbe) to head (7631aee).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1528   +/-   ##
=======================================
  Coverage   95.30%   95.30%           
=======================================
  Files          43       43           
  Lines        3198     3198           
=======================================
  Hits         3048     3048           
  Misses        150      150           

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