[Helm integration] Remove handler implementation from Operator controller and reuse from Rukpak

[varshaprasad96]

Reuse the handler in Rukpak to covert registryV1 to chart: https://github.com/operator-framework/rukpak/blob/19e1839a4d6bb44a15bfcd8f876b5780ecdbc445/internal/provisioner/registry/registry.go#L22

The only value from BD that it needs is spec.InstallName, which we can set from CE while creating a mock for BD in the controller:

operator-controller/internal/controllers/clusterextension_controller.go

Line 256 in 570b89f

bd := r.generateBundleDeploymentForUnpack(bundle.Image, ext)

.

This requires us to make handler code external.

[makon57]

/assign

[varshaprasad96]

This issue has been addressed as a part of #928. Hence closing it now.