ci: run cargo test instead of cargo check in "cargo test" jobs

[cakebaker]

I noticed that while we have jobs named "cargo test" in the CI, they don't run cargo test but cargo check, and are almost identical to the "cargo check" jobs. This PR runs cargo test instead of cargo check in the "cargo test" jobs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.80%. Comparing base (393f0b9) to head (ab1c2ba).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
- Coverage   58.85%   58.80%   -0.06%     
==========================================
  Files          30       30              
  Lines        3855     3855              
  Branches      846      851       +5     
==========================================
- Hits         2269     2267       -2     
  Misses       1254     1254              
- Partials      332      334       +2     

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