Fix v1beta1.CustomRun GVK

[wlynch]

Changes

Follow up to #6531 (comment)

This was using Runs but should be CustomRuns.
Be aware this is potentially breaking behavior, but is a bug fix to what the value should be.

/kind bug

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Release Notes

BREAKING CHANGE: v1beta1.CustomRuns GVK was changed to properly match it's type (Runs -> CustomRuns). This may break relationships that are relying on the incorrect GVK value. Clients not relying on the GVK value from the Go type are unaffected.

[jsminem]

Thanks so much!
/kind cleanup

[vdemeester]

/approve

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[jerop]

thanks @wlynch!

/lgtm