hilt_android requires seven separate annotation processors, which
is only feasible to support using exported_plugins to avoid having
to list all seven in every module that uses it. Unfortunately they
all set generates_api: true. Turbine is already disabled for modules
that directly use a plugin that sets generates_api: true, because
turbine doesn't run annotation processors. Also add support for
disabling turbine if a module transitively uses a plugin that
generates APIs via exported_plugins.
Bug: 173397767
Test: TestExportedPlugins
Change-Id: If70354a3dd67efb4ce88bc9c934d41ccb6241b28
c9fe10f5b8