fix(backend): RetrievePodName with POD_NAMES v1

[112358fn]

Description of your changes:

Closes #12308

Similarly to the solution implemented for the frontend in this PR: #11682
we should use the annotation workflows.argoproj.io/pod-name-format in the RetrievePodName function to get the right pod names when setting POD_NAMES=v1 in the workflows-controller

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[google-oss-prow]

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[juliusvonkohout]

/ok-to-test

[droctothorpe]

Nice catch and fix, @112358fn ! I rebased your branch.
/lgtm

[112358fn]

@droctothorpe Thanks 🙏 !

[google-oss-prow]

New changes are detected. LGTM label has been removed.

[google-oss-prow]

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[juliusvonkohout]

@droctothorpe do you encounter the same as in #12308 (comment) ?

[juliusvonkohout]

@112358fn please fix the linting errors https://github.com/kubeflow/pipelines/actions/runs/18257160080/job/51980095073?pr=12303

[112358fn]

@juliusvonkohout I have fixed the linting errors from my changes. I did not fix the rest of the errors as they will introduce changes to the PR that are not relevant to the issue we are addressing. I could open a separate PR to fix the linting errors outside my changes and then re-base this PR

[juliusvonkohout]

@juliusvonkohout I have fixed the linting errors from my changes. I did not fix the rest of the errors as they will introduce changes to the PR that are not relevant to the issue we are addressing. I could open a separate PR to fix the linting errors outside my changes and then re-base this PR

As long as https://github.com/kubeflow/pipelines/actions/runs/18280622951/job/52042678894?pr=12303 is failing the merging will be blocked.