Use preinstalled rust & CARGO_INCREMENTAL=0 for faster CI

[oech3]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.12%. Comparing base (89a5327) to head (40dd4dc).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #619      +/-   ##
==========================================
- Coverage   91.76%   89.12%   -2.64%     
==========================================
  Files          31       31              
  Lines        6203     6399     +196     
  Branches      328      328              
==========================================
+ Hits         5692     5703      +11     
- Misses        390      575     +185     
  Partials      121      121              

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