Make it possible to override chart repository in a particular pipeline

[msvticket]

Testing a new helm registry is cumbersome since the setting in jx-requirements.yaml overrides JX_CHART_REPOSITORY. Also it is impossible to test the default values, like automatically using the .Cluster.Registry for OCI. This PR fixes these issues.

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[msvticket]

/retest

[msvticket]

/cc tomhobson JordanGoasdoue Skisocks mentlak0

[msvticket]

I realised that the new implementation of FindRepositoryURL won't play nice with jx promote. So I need think this through another round.

[msvticket]

I split out the non-problematic part to a separate PR #1051

[Skisocks]

@msvticket is this still required? Still in draft so not sure if you want it reviewing :)

[msvticket]

I think there is a need, but the change would require changes in jx promote as well. And I'm not sure it is worth the effort... No, I don't expect reviews on draft unless I ask for it explicitly. I should have removed you as reviewer when switching this to draft.