fix(multichain-account-service): add missing MultichainAccountService:resyncActions action (#7093)

## Explanation

Add this missing action.

## References

- #7087

## Checklist

- [ ] I've updated the test suite for new or updated code as appropriate
- [ ] I've updated documentation (JSDoc, Markdown, etc.) for new or
updated code as appropriate
- [ ] I've communicated my changes to consumers by [updating changelogs
for packages I've
changed](https://github.com/MetaMask/core/tree/main/docs/contributing.md#updating-changelogs),
highlighting breaking changes as necessary
- [ ] I've prepared draft pull requests for clients and consumer
packages to resolve any breaking changes

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Registers the `MultichainAccountService:resyncAccounts` action, adds
its types, updates tests, and amends the changelog.
> 
> - **Service**
> - Register action handler `MultichainAccountService:resyncAccounts` to
invoke `resyncAccounts()` in `src/MultichainAccountService.ts`.
> - **Types**
> - Add `MultichainAccountServiceResyncAccountsAction` and include it in
`MultichainAccountServiceActions` in `src/types.ts`.
> - **Tests**
> - Add test to verify calling `MultichainAccountService:resyncAccounts`
triggers `service.resyncAccounts()` in
`MultichainAccountService.test.ts`.
> - **Changelog**
> - Update entry to note `resyncAccounts` method and action with PR
references.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
0a600fa. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: ccharly

packages/multichain-account-service/CHANGELOG.md

@@ -11,7 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **BREAKING:** Added error reporting around account creation with the `ErrorReportingService` ([#7044](https://github.com/MetaMask/core/pull/7044))
   - The `@metamask/error-reporting-service` is now a peer dependency.
-- Add `MultichainAccountService.resyncAccounts` method and action ([#7087](https://github.com/MetaMask/core/pull/7087))
+- Add `MultichainAccountService.resyncAccounts` method and action ([#7087](https://github.com/MetaMask/core/pull/7087)), ([#7093](https://github.com/MetaMask/core/pull/7093))
 - Add `*AccountProvider.resyncAccounts` method ([#7087](https://github.com/MetaMask/core/pull/7087))
 
 ### Changed

packages/multichain-account-service/src/MultichainAccountService.test.ts

@@ -996,6 +996,16 @@ describe('MultichainAccountService', () => {
       expect(wallet).toBeDefined();
       expect(wallet.entropySource).toBe('abc');
     });
+
+    it('resync accounts with MultichainAccountService:resyncAccounts', async () => {
+      const { messenger, service } = await setup({
+        accounts: [MOCK_HD_ACCOUNT_1],
+      });
+
+      const resyncAccountsSpy = jest.spyOn(service, 'resyncAccounts');
+      await messenger.call('MultichainAccountService:resyncAccounts');
+      expect(resyncAccountsSpy).toHaveBeenCalled();
+    });
   });
 
   describe('resyncAccounts', () => {

packages/multichain-account-service/src/MultichainAccountService.ts

@@ -162,6 +162,10 @@ export class MultichainAccountService {
       'MultichainAccountService:createMultichainAccountWallet',
       (...args) => this.createMultichainAccountWallet(...args),
     );
+    this.#messenger.registerActionHandler(
+      'MultichainAccountService:resyncAccounts',
+      (...args) => this.resyncAccounts(...args),
+    );
 
     this.#messenger.subscribe('AccountsController:accountAdded', (account) =>
       this.#handleOnAccountAdded(account),

packages/multichain-account-service/src/types.ts

@@ -83,6 +83,11 @@ export type MultichainAccountServiceCreateMultichainAccountWalletAction = {
   handler: MultichainAccountService['createMultichainAccountWallet'];
 };
 
+export type MultichainAccountServiceResyncAccountsAction = {
+  type: `${typeof serviceName}:resyncAccounts`;
+  handler: MultichainAccountService['resyncAccounts'];
+};
+
 /**
  * All actions that {@link MultichainAccountService} registers so that other
  * modules can call them.
@@ -97,7 +102,8 @@ export type MultichainAccountServiceActions =
   | MultichainAccountServiceSetBasicFunctionalityAction
   | MultichainAccountServiceAlignWalletAction
   | MultichainAccountServiceAlignWalletsAction
-  | MultichainAccountServiceCreateMultichainAccountWalletAction;
+  | MultichainAccountServiceCreateMultichainAccountWalletAction
+  | MultichainAccountServiceResyncAccountsAction;
 
 export type MultichainAccountServiceMultichainAccountGroupCreatedEvent = {
   type: `${typeof serviceName}:multichainAccountGroupCreated`;