yaml/python workflow update - add missing pom file change detection

[derrickaw]

1. During the new yaml/python workflow creation - Add yaml and python workflow #3241, missed the pom files.
2. Adding pom file detection except in v1 and v2 folders.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.19%. Comparing base (a446e55) to head (7698739).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #3374   +/-   ##
=========================================
  Coverage     36.19%   36.19%           
  Complexity      440      440           
=========================================
  Files           192      192           
  Lines         11001    11001           
  Branches       1083     1083           
=========================================
  Hits           3982     3982           
  Misses         6706     6706           
  Partials        313      313           

Components	Coverage Δ
spanner-templates	∅ <ø> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	∅ <ø> (∅)
spanner-live-reverse-replication	∅ <ø> (∅)
spanner-bulk-migration	∅ <ø> (∅)
gcs-spanner-dv	∅ <ø> (∅)

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