feat(vue-starter-template): api error handler util

[mdanilowicz]

This pull request refactors error handling across multiple account-related components by introducing a centralized apiErrorHandler utility. This change simplifies and standardizes how API errors are processed and displayed to users, replacing repetitive error handling code with a single function call. Additionally, unused imports and functions related to error handling are removed from affected files.

Error Handling Refactor

• Added new apiErrorHandler utility in utils/validation/rules/errors/apiErrorHandler.ts to handle API errors in a consistent and reusable way across components.
• Replaced custom error handling logic in form and account components (LoginForm.vue, RegistrationForm.vue, NewsletterBox.vue, index.vue, change-email.vue, change-password.vue, profile/index.vue) with calls to apiErrorHandler, streamlining error display and reducing code duplication. [1] [2] [3] [4] [5] [6] [7]

Cleanup of Imports and Unused Functions

• Removed unused ApiClientError imports and resolveApiErrors function calls from components where error handling is now delegated to apiErrorHandler. [1] [2] [3] [4]

Minor Code Consistency

• Adjusted the order of destructuring for pushSuccess and pushError from useNotifications for consistency in LoginForm.vue.

closes #2077

[vercel[bot]]

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