Enabled movable Custom Views

[sbatten]

This PR refs #85164

• Updates the tree view to enable updating of the styling
• Add events to ViewDescriptorService that allow listening for Container and Location change
• Add methods to ViewDescriptorService to get the view location. This works even before the container is registered and will trigger an event if the cached data turns out to be stale.
• Outline follows similar logic so included as well

[sandy081]

Reviewed changes in ViewDescriptorService. Requested one change.
Approving it expecting that requested change is taken care of.

Thanks.

[sandy081]

I think we shall also check location change here even though currently location change is not yet supported in registry. This should be ready for future if it is allowed.

I would recommend to have a single method that can be reused when views are moved in registry or in cache.

this.removeViews(from, views);
 this.addViews(to, views);

  const oldLocation = this.viewContainersRegistry.getViewContainerLocation(from)!;
 const newLocation = this.viewContainersRegistry.getViewContainerLocation(to)!;

  if (oldLocation !== newLocation) {
 	this._onDidChangeLocation.fire({ views, from: oldLocation, to: newLocation });
 }

 this._onDidChangeContainer.fire({ views, from, to });

[sbatten]

@sandy081 thanks, will take care of this.

[sbatten]

It would still be great to get approval from:
@joaomoreno on TreeView styling changes
@alexr00 for general CustomView updates

[joaomoreno]

Changes in listService make sense!

[alexr00]

The custom view changes look good!

[sandy081]

@sbatten Merging the PR as we have all approvals.
I will also take care of doing the change I suggested after merging.