Fleet fix HelmOp OCI storage field

[torchiaf]

Setup

• Rancher version:
• Rancher UI Extensions:
• Browser type & version:

Describe the bug

When creating HelmOps from an OCI registry, the Ui saves the value in spec.helm.chart. The source field has been changed to spec.helm.repo - https://github.com/rancher/fleet/pull/3795

We need to adapt the UI accordingly

To Reproduce

Result

Expected Result

Screenshots

Additional context