Fix PostCommit Java ValidatesRunner Samza job

[Amar3tto]

Fixes #31725

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[Amar3tto]

R: @Abacn

[github-actions]

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

[Abacn]

this test is exercises by different runner's vallidaterunner test suite. Only SamzaRunner fails. Would this change break other runners test?

Probably we just need to exclude this specific test from validateRunner target in runners/samza/build.gradle

[Amar3tto]

It doesn't break other tests (tested with DirectRunner). If we pass 0, then it searches for file.txt*.

[Abacn]

I see, then it will no longer assert if the GroupintoBatches works as intended for those runners currently passing this test. Still think exclude from SamzaRunner test suite is preferred for now

[Amar3tto]

Done