chore: remove addNewAccountWithoutUpdate

[mikesposito]

Explanation

As updating identities in clients isn't a KeyringController responsibility anymore, the addNewAccountWithoutUpdate has no reason to exist here.

This method is currently used in one place, and there is an open PR to remove it.

References

• Related to [keyring-controller] addAccountWithoutUpdate now updates the PreferencesController state #3848

Changelog

@metamask/keyring-controller

• BREAKING: Remove addNewAccountWithoutUpdate

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 highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes