Bazel: Don't depend transitively on plugin API

find-owners rules cannot depend on prolog:gerrit-prolog-common library,
because this would pull in the whole gerrit core.

Instead, it should depend on the plugin API with neverlink attribute,
because gerrit-prolog-common is already a part of the plugin API. This
fix reduces the plugin size by factor 50, to 1 MB only.

Change-Id: I8a85a36ea70cf44f8123db252ad29295bc9a3f35