resourceloader: Skip modules with circular deps in tree optimiser

resourceloader: Skip modules with circular deps in tree optimiser

Either the server needs to omit these from the registry with
state=error output to the client (and server-side error logging),
or it needs to detect them, and transport them unchanged, so that
the existing client-side logic can handle it.

This patch does the latter.

Without the source code change in this patch, the added test case
fails due to "top" and "middle1" then being registered with
an empty array as dependencies.

Bug: T223402
Change-Id: I57502d7c4e434de4737759aed325dd4200ca89bf