Fix Postcommit Java IO Performance tests workflow and BigQuery Stress Test

[akashorabek]

Fixes: #30527
Successful PostCommit Java IO Performance Tests example: https://github.com/akashorabek/beam/actions/runs/13194245851
Successful BigQuery Stress test example: https://github.com/akashorabek/beam/actions/runs/13194261396
Screen that correct number of rows were written to both tables (PostCommit Java IO Performance Tests):
Expected table:

Actual table:

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[akashorabek]

R: @damccorm

[github-actions]

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[Abacn]

Thank you!