[cargo-nextest] change no-tests behavior

[sunshowers]

Per #1646.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.66%. Comparing base (4d8f74e) to head (96c4ce9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1881   +/-   ##
=======================================
  Coverage   79.66%   79.66%           
=======================================
  Files          80       80           
  Lines       20523    20520    -3     
=======================================
- Hits        16349    16347    -2     
+ Misses       4174     4173    -1     

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