Fix PostCommit Java Examples Dataflow V2 workflow

[akashorabek]

Fixes: #33646
Successful run example: https://github.com/akashorabek/beam/actions/runs/15141978605

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[Abacn]

Is this "latest" tag needed? Below it sets DOCKER_TAG to a unique tag, overrides this default. And checked us.gcr.io/apache-beam-testing/github-actions/beam_java17_sdk_distroless no image has tagged "latest"

[akashorabek]

Thanks for catching that, I’ve removed the line.

[sjvanrossum]

I had another look at this build file yesterday and it seemed to me like there's some duplicate and outdated bits and pieces that I started to clean up in #34999. I haven't had time to come back to it with a blank mind, but feel free to cherry-pick from that PR if those changes make any sense.

[Abacn]

Thanks @sjvanrossum ! Let me merge this at the moment to bring back test green. Take your time on #34999.