Ignore bazel-generated paths in dangling rule test

Bazel is expected to generate some files and symlinks that will not be
created by aquery, we explicitly ignore files that are in bazel output
paths but are not in a generated file directory.

Test: $ m --bazel-mode-staging checkbuild and verify it gets past
   dangling rule test
Fixes: 258396112
Change-Id: I6dc45ea2613c9e1488ad3eda2313033c717217ff