Add more detailed new revision job handling

Create a new events table for the new guix revision jobs, and update this when
processing a job starts, as well as finished with success or failure.

Additionally, remove the dependnency on open-inferior/container, as this
functionality isn't merged in to Guix master yet.

sqitch/verify/load_new_guix_revision_job_events.sql

@@ -0,0 +1,8 @@
+-- Verify guix-data-service:load_new_guix_revision_job_events on pg
+
+BEGIN;
+
+SELECT id, job_id, event, occurred_at
+  FROM load_new_guix_revision_job_events WHERE FALSE;
+
+ROLLBACK;