[CI] Skip Python Client unit tests when only documentation changes are made

[dnskr]

Why are the changes needed?

The PR disables Python Client unit tests for documentation-only changes as not needed, similar to PR #7223.

How was this patch tested?

The PR was not tested directly, but it is similar to already tested PR #7223.

Was this patch authored or co-authored using generative AI tooling?

No

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (3b205a3) to head (2184c03).

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #7225   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files         696     696           
  Lines       43530   43530           
  Branches     5883    5883           
======================================
  Misses      43530   43530           

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