resourceloader: Remove slow structure test for checking getVersionHash

resourceloader: Remove slow structure test for checking getVersionHash

This isn't needed because the startup module validates this already.

The vast majority of modules are FileModule instances which can't be invalid,
because a separate test asserts that class already. This test existed for
validating the format of version hashes returned by a theoretical Module
sub class in an extension that (badly) overrides the getVersionHash method.

As of writing, no extension overrides that method. And more importantly,
the startup module already validates this at run-time, and logs a warning.
This commit turns that into an exception, which would get logged in a way
that Jenkins will fail the build if encountered.

This structure test, which computed the response for all registered modules,
previously took 3-5 seconds in CI.

Bug: T225730
Change-Id: Id2e37434b0ccd95dd2279f04e2230e9c06b09ccb