Remove fest_util production direct dependency

This change removes the direct dependency from robolectric -> fest_util.

Users of Robolectric can avoid fest_util version skew if they use a version of fest_reflect that does not call through to an incompatible version of fest_util.

This solves our version skew problem for the time being. However it would be reintroduced if Robolectric starts making use of other fest_refect apis that DO call through to fest_util.

Long term I believe its better not to use fest_reflect at all. I'm also happy to contribute a follow up that removes fest_reflect if the maintainers are supportive.