Remove legacy bcs registry (#16425)

Describe the changes or additions included in this PR.

How did you test the new or updated feature?

---
If your changes are not user-facing and do not break anything, you can
skip the following section. Otherwise, please briefly describe what has
changed under the Release Notes section.

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

apps/wallet/src/ui/app/WalletSigner.ts

@@ -41,7 +41,7 @@ export abstract class WalletSigner {
 		const signature = await this.signData(
 			messageWithIntent(
 				IntentScope.PersonalMessage,
-				bcs.ser(['vector', 'u8'], input.message).toBytes(),
+				bcs.vector(bcs.u8()).serialize(input.message).toBytes(),
 			),
 		);
 

sdk/bcs/src/index.ts

@@ -23,8 +23,6 @@ import { decodeStr, encodeStr, splitGenericParameters } from './utils.js';
 import type { BcsWriterOptions } from './writer.js';
 import { BcsWriter } from './writer.js';
 
-export * from './legacy-registry.js';
-
 // Re-export all encoding dependencies.
 export {
 	bcs,