SY-4297: Arc Params Refactor (Part 8) - Data Migration (#2493)

* SY-4297: Add v56 migration for config to inputs unification

Migrate persisted Arc programs from the separate config/inputs layout to the unified inputs list. The v56 to live step folds config into inputs config-first and dedupes the legacy ExecBoth mirror; the chain runs
v54 to v56 to live and preserves the set_status rename through the retarget. Rewire the arc service gorp migration chain accordingly.

Author: sy-nico

arc/go/compiler/migrations/v56/codec.gen.go

@@ -0,0 +1,12 @@
+// Copyright 2026 Synnax Labs, Inc.
+//
+// Use of this software is governed by the Business Source License included in the file
+// licenses/BSL.txt.
+//
+// As of the Change Date specified in that file, in accordance with the Business Source
+// License, use of this software will be governed by the Apache License, Version 2.0,
+// included in the file licenses/APL.txt.
+
+// Generated by oracle as a template. Edit this file.
+
+package v54