Validate config on NewApplication (#12997)

* validate config on new application spawn

* Add changeset

* Check config only in the rebroadcast-transactions command

.changeset/pink-schools-provide.md

@@ -0,0 +1,5 @@
+---
+"chainlink": patch
+---
+
+#bugfix Fixed an issue where the `rebroadcast-transactions` commands did not execute config validation.

core/cmd/shell_local.go

@@ -580,6 +580,11 @@ func (s *Shell) RebroadcastTransactions(c *cli.Context) (err error) {
 		}
 	}
 
+	err = s.Config.Validate()
+	if err != nil {
+		return err
+	}
+
 	lggr := logger.Sugared(s.Logger.Named("RebroadcastTransactions"))
 	db, err := pg.OpenUnlockedDB(s.Config.AppID(), s.Config.Database())
 	if err != nil {