fix(32): WR-07 close the relation and partial routes of hidden owner fields

Hide removed an owner field from the schema, show and save, but a hidden
relation-manager field's relation routes (panel, link, unlink, child CRUD,
deferred commit) and a hidden partial field's partial stayed reachable.
dropHiddenFields now drops the relation and the partial path too; a partial
the list or preview header or another field still uses keeps rendering.

modules/pact/capabilities.go

@@ -481,7 +481,9 @@ const (
 // only when that plugin is in the contributor's Requires().
 //
 // Hide lists owner fields the form leaves out for everyone: they leave the
-// schema, show and save, and a tab without fields disappears. Permissions
+// schema, show and save, a hidden relation-manager field's relation routes
+// and a hidden partial field's record render answer 404, and a tab without
+// fields disappears. Permissions
 // are backend permission codes an administrator needs to see the extension's
 // fields; Visible, when set, is asked per request as well. An administrator
 // who fails either gets none of the fields in the schema or the record, and a