Remove Rust jobserver fd reference

[samuel-jimenez]

Strip CARGO_MAKEFLAGS environment variable. Under a distributed environment, the file descriptors referenced by the client are not present on a build server.

Resolves #2333.

[sylvestre]

would it be possible to add a test to make sure we don't regress? thanks

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (0cc0c62) to head (0198acd).
Report is 151 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #2336       +/-   ##
==========================================
- Coverage   30.91%       0   -30.92%     
==========================================
  Files          53       0       -53     
  Lines       20112       0    -20112     
  Branches     9755       0     -9755     
==========================================
- Hits         6217       0     -6217     
+ Misses       7922       0     -7922     
+ Partials     5973       0     -5973     

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