Add BlockSparseArrays as a downstream test

[mtfishman]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.16%. Comparing base (9f3c59f) to head (220212b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   91.56%   91.16%   -0.41%     
==========================================
  Files          15       15              
  Lines         498      498              
==========================================
- Hits          456      454       -2     
- Misses         42       44       +2     

Flag	Coverage Δ
docs	0.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.