[Bug]: Error message for group by coders validation in portable local runner is misleading.

[byronellis]

What happened?

The Python portable runner validation code for group by coders is wrong and/or misleading. It's wrong in the sense that the message parameters are in the wrong order, but also misleading in that it checks more than equality but reports everything as a failure of equality.

Issue Priority

Priority: 3 (minor)

Issue Components

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[goutamadwant]

.take-issue

[goutamadwant]

Opened #39800 to fix this. It reports each GroupByKey coder mismatch clearly and adds regression tests for every validation path. Let me know if there are any comments/suggestions. thanks!