Consider beam_services option when determining the expansion service type

[chamikaramj]

This fixes #27346

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[chamikaramj]

R: @bvolpato

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[chamikaramj]

@Abacn we either need to cherry-pick this (or revert #27228) to prevent the Google tests from failing when running with the 2.49.0 release.

[codecov]

Codecov Report

Merging #27345 (2c30acf) into master (e8d8043) will increase coverage by 0.01%.
The diff coverage is 42.85%.

@@            Coverage Diff             @@
##           master   #27345      +/-   ##
==========================================
+ Coverage   71.22%   71.23%   +0.01%     
==========================================
  Files         854      854              
  Lines      103712   103716       +4     
==========================================
+ Hits        73873    73887      +14     
+ Misses      28292    28282      -10     
  Partials     1547     1547              

Flag	Coverage Δ
python	80.58% <42.85%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/transforms/external.py	75.66% <25.00%> (-0.42%)	⬇️
sdks/python/apache_beam/utils/subprocess_server.py	58.73% <66.66%> (ø)

... and 5 files with indirect coverage changes

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[chamikaramj]

Thanks.