Detect incorrect sequence owners

What does this MR do and why?

This commit builds upon !196044 (merged) and makes it possible to identify wrong owners for sequences.

Relates to #396878

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

I used my test database to avoid mucking with the real database:

1. gdk psql -d gitlabhq_test -c "ALTER SEQUENCE zoekt_enabled_namespaces_id_seq OWNED BY web_hook_logs_daily.id"
2. Run RAILS_ENV=test bin/rake gitlab:db:schema_checker:run. You should see this in the output:

------------------------------------------------------
The sequence public.zoekt_enabled_namespaces_id_seq has a different owner between structure.sql and database
Diff:
 CREATE SEQUENCE public.zoekt_enabled_namespaces_id_seq;
-ALTER SEQUENCE public.zoekt_enabled_namespaces_id_seq OWNED BY public.zoekt_enabled_namespaces.id
+ALTER SEQUENCE public.zoekt_enabled_namespaces_id_seq OWNED BY public.web_hook_logs_daily.id

4. To restore the permissions, run: gdk psql -d gitlabhq_test -c "ALTER SEQUENCE public.zoekt_enabled_namespaces_id_seq OWNED BY public.zoekt_enabled_namespaces.id".
5. RAILS_ENV=test bin/rake gitlab:db:schema_checker:run should no longer report this difference.

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