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

[ccharly]

Explanation

Add this missing action.

References

• fix(multichain-account-service)!: add resyncAccounts support #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, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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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.

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