.pipeline/helm.yaml: Update chart object
.pipeline/helm.yaml: Update chart object

Removes the chart url from the chart definition and adds a name
property. Chart registry location is now stored in PipelineLib.

Bug: T261346
Depends-on: Ifeb5caec6bf120b86ae16afd0315d98ffbc63dad
Change-Id: Ibae2dc01ea1b8f509695d6a9ac0da74ddee60e30

wikimedia/mathoid,wikimedia/mathoid,wikimedia/mathoid,wikimedia/mathoid