Remove move-only adapter support

Summary:
`cpp.Adapter.moveOnly` no longer affects C++ code generation, and every production use was attached to a copyable adapted type. Remove the annotation field, stale annotations, move-only fixtures, and regenerate affected fixture outputs.

Field ID 5 remains unreserved so existing serialized annotation payloads continue to decode without unknown-field enforcement. Keep the existing arithmetic `serializedSizeFixed` adapter-size support unchanged.

The Configerator-owned Metarmor source change is D116658723 and must land first.

Reviewed By: hchokshi

Differential Revision: D116659189

fbshipit-source-id: 93fe5691c8c85f9ab30f1e68d840cac3d15e6433

Author: iahs

thrift/annotation/cpp.thrift

@@ -176,9 +176,6 @@ struct Adapter {
    */
   3: string underlyingName;
   4: string extraNamespace;
-
-  /** Must set to true when adapted type is not copyable. */
-  5: bool moveOnly;
 }
 
 /**