Fix tests by recreating the repo every time

[abarciauskas-bgse]

I believe the issue here was that the repo was not getting torn down after each test, and using a fixture with the @pytest.fixture(scope="function") for the repo seems to fix the issue.

• Closes Fix append failures in upstream tests #415
• Tests passing

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.01%. Comparing base (24a4582) to head (0ec1ae3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #417   +/-   ##
=======================================
  Coverage   84.01%   84.01%           
=======================================
  Files          31       31           
  Lines        1839     1839           
=======================================
  Hits         1545     1545           
  Misses        294      294           

[TomNicholas]

Excellent!!

@mpiannucci you can tell us if there was a better way of doing this later :)

For now let's merge because this makes everything green!!!

[TomNicholas]

Actually just before merging @abarciauskas-bgse can you add/change release notes to note that we actually support icechunk a12 now not a8? Then please merge