Disable public IP for Dataflow Python and Go Validate runner tests

[Abacn]

Please add a meaningful description for your change here

Python, Go counterpart of Java change: #38424

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.72%. Comparing base (2c53494) to head (41fcd43).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #38990   +/-   ##
=========================================
  Coverage     57.71%   57.72%           
  Complexity    13028    13028           
=========================================
  Files          2513     2513           
  Lines        261375   261406   +31     
  Branches      10722    10722           
=========================================
+ Hits         150863   150900   +37     
+ Misses       104795   104789    -6     
  Partials       5717     5717           

Flag	Coverage Δ
python	79.28% <ø> (+0.01%)	⬆️

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