errors: Lop off the string part of BorshIoError

#### Problem

The `BorshIoError` variant of `InstructionError` was changed from a
string to a unit variant in the Rust SDK in
[this PR](anza-xyz/solana-sdk#12), but the
change hasn't been reflected in Kit yet.

#### Summary of changes

Change the `BorshIoError` variant to lop off any string that comes back
for compatibility with old and new errors emitted by the runtime.

Add the new variant to the RPC error type list.

Author: joncinque

packages/errors/src/__tests__/instruction-error-test.ts

@@ -51,6 +51,7 @@ const EXPECTED_ERROR_CODES = [
     ['ProgramFailedToCompile', 4615042],
     ['Immutable', 4615043],
     ['IncorrectAuthority', 4615044],
+    ['BorshIoError', 4615045],
     ['AccountNotRentExempt', 4615046],
     ['InvalidAccountOwner', 4615047],
     ['ArithmeticOverflow', 4615048],
@@ -95,11 +96,10 @@ describe('getSolanaErrorFromInstructionError', () => {
             }),
         );
     });
-    it('produces the correct `SolanaError` for a `BorshIoError` error', () => {
+    it('produces the correct `SolanaError` for a `BorshIoError` error from a string', () => {
         const error = getSolanaErrorFromInstructionError(123, { BorshIoError: 'abc' });
         expect(error).toEqual(
             new SolanaError(SOLANA_ERROR__INSTRUCTION_ERROR__BORSH_IO_ERROR, {
-                encodedData: 'abc',
                 index: 123,
             }),
         );

packages/errors/src/instruction-error.ts

@@ -1,8 +1,4 @@
-import {
-    SOLANA_ERROR__INSTRUCTION_ERROR__BORSH_IO_ERROR,
-    SOLANA_ERROR__INSTRUCTION_ERROR__CUSTOM,
-    SOLANA_ERROR__INSTRUCTION_ERROR__UNKNOWN,
-} from './codes';
+import { SOLANA_ERROR__INSTRUCTION_ERROR__CUSTOM, SOLANA_ERROR__INSTRUCTION_ERROR__UNKNOWN } from './codes';
 import { SolanaError } from './error';
 import { getSolanaErrorFromRpcError } from './rpc-enum-errors';
 
@@ -89,11 +85,6 @@ export function getSolanaErrorFromInstructionError(
                         code: Number(rpcErrorContext as bigint | number),
                         index: numberIndex,
                     };
-                } else if (errorCode === SOLANA_ERROR__INSTRUCTION_ERROR__BORSH_IO_ERROR) {
-                    return {
-                        encodedData: rpcErrorContext as string,
-                        index: numberIndex,
-                    };
                 }
                 return { index: numberIndex };
             },

packages/rpc-types/src/transaction-error.ts

@@ -54,7 +54,8 @@ type InstructionError =
     | 'UninitializedAccount'
     | 'UnsupportedProgramId'
     | 'UnsupportedSysvar'
-    | { BorshIoError: string }
+    | 'BorshIoError' // SDKv3 has a fieldless `BorshIoError`
+    | { BorshIoError: string } // SDK pre-v3 has a newtype for `BorshIoError`
     | { Custom: CustomProgramError };
 
 type InstructionIndex = number;