[#24789] Missed prism defaults and programming guide changes

[lostluck]

Additional constants were changed to use prism as the default Runner for tests.

See #24789 and #27550

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[codecov]

Codecov Report

Merging #27832 (8bb1053) into master (1b76101) will decrease coverage by 0.01%.
Report is 25 commits behind head on master.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master   #27832      +/-   ##
==========================================
- Coverage   70.97%   70.97%   -0.01%     
==========================================
  Files         860      860              
  Lines      104862   104862              
==========================================
- Hits        74430    74422       -8     
- Misses      28873    28882       +9     
+ Partials     1559     1558       -1     

Flag	Coverage Δ
go	53.71% <50.00%> (-0.03%)	⬇️

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Files Changed	Coverage Δ
sdks/go/pkg/beam/testing/ptest/ptest.go	55.55% <50.00%> (ø)

... and 11 files with indirect coverage changes

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[riteshghorse]

LGTM, thanks!