Use correct main branch in image publishing of external-snapshot-metadata

[hairyhum]

Follow-up to #33303

Addressing #33303 (comment)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hairyhum
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[hairyhum]

/assign @xing-yang @Rakshith-R

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/assign @xing-yang @Rakshith-R

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[xing-yang]

/ok-to-test

[Rakshith-R]

There's one more place that needs the same change.

test-infra/config/jobs/image-pushing/k8s-staging-sig-storage.yaml

Line 343 in b072da3

- ^master$

[xing-yang]

Hmm, we have a problem here. This is an auto-generated file.

[xing-yang]

You'll need to modify gen-jobs.sh to automatically set it to "main" for external-snapshot-metadata: https://github.com/kubernetes/test-infra/pull/33303/files#diff-a8e1d6d57695368eeaaf2c7b80d75ce59078cea09d2218469a6a5dc7009dc8f5

[hairyhum]

@xing-yang @Rakshith-R updated the template and re-generated.

[xing-yang]

This will break jobs for all other sidecars.