Retire node-resolver-config and the seat need it alone used (hq ADR 0223)

The uplink's holder writes /etc/resolv.conf, so the seat that wrote it and
ADR 0220's dependency of it on the uplink have nothing left to say. The
migration deletes the store's row; nothing holds it once resolv-conf is
unassigned everywhere.

internal/inventory/migrations/0064-the-resolver-file-is-the-uplinks.sql

@@ -0,0 +1,17 @@
+-- What a machine asks for names is the uplink's holder's to write (novox/hq ADR 0223, retiring what
+-- ADR 0121 and ADR 0220 decided for node-resolver-config).
+--
+-- `/etc/resolv.conf` is written by the module holding `node-uplink` — the program that would otherwise
+-- rewrite it — so the seat whose holder wrote it, and its need of the uplink beside it, go. Its only
+-- claimant, `resolv-conf`, declared nothing for one release while every machine handed the file to its
+-- uplink module in one apply, and was then unassigned everywhere and forgotten before this runs.
+--
+-- **The compiled defaults no longer carry it, and that alone would not remove it**: seeding adds a
+-- seat a release ships and never takes one away (ADR 0122), as 0060 found for the per-node resolver.
+-- A holding on record goes with it by cascade; a node seat has none. No alias is kept: nothing was
+-- renamed, and a manifest still claiming the old name should be refused at registration, naming it.
+--
+-- Numbered after 0063 (node-hosts-file renamed to node-hostname), which is expected to merge first;
+-- if this one lands first, the two are renumbered so the order they merge in is the order they run.
+delete from seat_alias where seat = 'node-resolver-config' or alias = 'node-resolver-config';
+delete from seat where name = 'node-resolver-config';