Revert "Delete FalsingManager tests that are very flaky."

This reverts commit d3c44b51f981ce2985eefb10b1e5c62a8d50c138.

Reason for revert: ag/9255655 may be a fix.

Bug: 139860714
Change-Id: Ie10ca227aad80b81f39f7a4f949a9edd8feb0661
1 file changed