Docs: add information about --passWithNoTests flag

[lovell]

Summary

Hello, this PR adds documentation for the new --passWithNoTests flag added in v22.0.0 via #3672

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[codecov-io]

Codecov Report

Merging #5207 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #5207   +/-   ##
======================================
  Coverage    60.8%   60.8%           
======================================
  Files         201     201           
  Lines        6707    6707           
  Branches        3       3           
======================================
  Hits         4078    4078           
  Misses       2628    2628           
  Partials        1       1

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[cpojer]

Thanks! We must have missed this one.

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