test: drop aicsimageio test

[tlambert03]

the aicsimageio tests fail more often than others, for issues unrelated to nd2. it's in maintenance mode so testing here is probable unnecessary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.98%. Comparing base (c1848a3) to head (bd0f165).

❗ Current head bd0f165 differs from pull request most recent head cb18983. Consider uploading reports for the commit cb18983 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
- Coverage   95.27%   94.98%   -0.29%     
==========================================
  Files          18       18              
  Lines        2433     2433              
==========================================
- Hits         2318     2311       -7     
- Misses        115      122       +7     

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[codspeed-hq]

CodSpeed Performance Report

Merging #227 will not alter performance

_{Comparing drop-aicsimageio-test (cb18983) with main (c1848a3)}

Summary

✅ 13 untouched benchmarks