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/revert/load_new_guix_revision_job_events.sql

@@ -0,0 +1,12 @@
+-- Revert guix-data-service:load_new_guix_revision_job_events from pg
+
+BEGIN;
+
+DROP TABLE load_new_guix_revision_job_events;
+
+ALTER TABLE load_new_guix_revision_jobs
+  DROP CONSTRAINT load_new_guix_revision_jobs_id;
+
+DROP TYPE IF EXISTS job_event;
+
+COMMIT;