[release-v0.47.x] Fix v1beta1 pipelineref bundle conversion to resolver

[JeromeJu]

Changes

This is a cherry-pick of #6791

This commit fixes the bundle conversion for PipelineRef which should be converting to the bundle Resolver with a Pipeline kind. It also adds the conversion integration tests for the bundle logics to prevent such error. It extracts the setup for bundle and makes it into a helper function.

/kind bug

Submitter Checklist

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Release Notes

bug fix: bundle resolver type param value for pipelineRef conversion

[vdemeester]

/approve
/lgtm

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