[BUG] VirtualAppList function can't handle nested Virtual Apps

[StefanKurek]

Describe the bug
While using the vcenterreceiver in the OTEL Collector, I came across a bug with a bug in the VirtualAppList function. It does not handle nested Virtual Apps in the way that the ResourcePoolList function can handle nested Resource Pools. See the collector issue here for a more detailed description.

To Reproduce
Steps to reproduce the behavior:

1. Tried to use the VirtualAppList function with an environment that had a Virtual App nested directly underneath another Virtual App. In this case, only the parent Virtual App is returned.

Expected behavior
Both Virtual Apps would be returned.

Affected version
v0.36.3 (But I looked at the code of the newest version, and it doesn't appear to fix anything)

Screenshots/Debug Output
NA

Additional context

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