The "revealResource" command does not work for Container Apps

Repro steps

See https://github.com/Azure/azure-dev/issues/2043

More information

In the Azure resource tree hierarchy, the subscription nodes (with id like /subscriptions/s1234 have children that are "groupings" (with id like /subscriptions/s1234/groupings/Azure Cosmos DB). The problem is "grouping" is not a valid part of an Azure resource ID, which typically have a resource group as the second designator, for example /subscriptions/s1234/resourceGroups/rg-foo/providers/Microsoft.App/containerApps/mygreatapp.

As a result, when the findItemById function starts processing children of the subscription tree item, none of the "groupings" is considered an ancestor of an Azure resource that is part of a resource group, so the tree item corresponding to the passed resource ID is not found and nothing is revealed.

Start with the Container Apps reproduction in issue 2043 and read findItemById in src/tree/ResourceTreeDataProviderBase.ts. Trace how subscription children with grouping IDs are compared with the passed Azure resource ID. Done means revealResource can locate and reveal a Container App under its resource group, with the relevant behavior covered by the existing tests if available.