va-file-input-multiple: Add vaMultipleError to component and fix bug in encrypted file story

[RyanMunsch]

Chromatic

https://5402-file-input-multiple-story-bug--65a6e2ed2314f7b8f98609d8.chromatic.com

Description

This pull request introduces improved error handling and state management for the va-file-input-multiple component, enabling more robust tracking of file errors and better synchronization between the web component and its Storybook demo. The main changes are the addition of a new error event, refactoring of file tracking logic, and updates to the demo to handle these enhancements.

Error Handling Improvements:

• Added a new vaMultipleError event to the va-file-input-multiple component, which emits detailed information when a child file input encounters an error. This allows parent components to track which file has an error and what the error is.
• Refactored error handling logic in the component by introducing a handleFileInputError method, which updates the file entry with error state and emits the new error event.
• Updated the component's rendering logic to use the new error handler for file input errors, replacing the previous inline error handling code.

State Management and Demo Updates:

• Refactored the Storybook demo (EncryptedTemplate) to track files and their error states separately, and to update the encrypted list based on file types and error states. Introduced new handleChange and handleError functions for more accurate state updates.
• Updated the Storybook demo to use the new error handler and change handler, connecting the demo to the improved error event and state tracking logic.

Related tickets and links

Closes department-of-veterans-affairs/vets-design-system-documentation#5402

Screenshots

Testing and review

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• Engineering: platform-design-system-fe
• Accessibility: platform-design-system-a11y
• Design: platform-design-system-designer

QA checklists

Use the QA checklists below as guides, not rules. Not all checklists will apply to every PR but there could be some overlap.

In all scenarios, changes should be fully tested by the author and verified by the reviewer(s); functionality, responsiveness, etc.

✨ New Component Added

• The PR has the minor label
• The component matches the Figma designs.
• All properties, custom events, and utility functions have e2e and/or unit tests
• A new Storybook page has been added for the component
• Tested in all VA breakpoints.
• Chromatic UI Tests have run and snapshot changes have been accepted by the design reviewer
• Tested in vets-website using Verdaccio
• Engineering has approved the PR
• Design has approved the PR
• Accessibility has approved the PR

🌱 New Component Variation Added

• The PR has the minor label
• The variation matches its Figma design.
• Any new properties, custom events, or utility functions have e2e and/or unit tests
• A new story has been added to the component's existing Storybook page
• Any Chromatic UI snapshot changes have been accepted by a design reviewer
• Tested in vets-website using Verdaccio
• Engineering has approved the PR
• Design has approved the PR

🐞 Component Fix

• The PR has the patch label
• Any new properties, custom events, or utility functions have e2e and/or unit tests
• Any markup changes are evaluated for impact on vets-website.
  • Will any vets-website tests fail from the change?
• Any Chromatic UI snapshot changes have been reviewed and approved by a designer if necessary
• Engineering has approved the PR

♿️ Component Fix - Accessibility

• The PR has the patch label
• Any new properties, custom events, or utility functions have e2e and/or unit tests
• Any Chromatic UI snapshot changes have been reviewed and approved by a designer if necessary
• Engineering has approved the PR
• Accessibility has approved the PR

🚨 Component Fix - Breaking API Change

• The PR has the major label
• vets-website and content-build have been evaluated to determine the impact of the breaking change
• Any new properties, custom events, or utility functions have e2e and/or unit tests
• Any Chromatic UI snapshot changes have been reviewed and approved by a designer if necessary
• Tested in vets-website using Verdaccio
• Engineering has approved the PR

🔧 Component Update - Non-Breaking API Change

• The PR has the minor label
• Any new properties, custom events, or utility functions have e2e and/or unit tests
• Any Chromatic UI snapshot changes have been reviewed and approved by a designer if necessary
• Engineering has approved the PR

📖 Storybook Update

• The PR has the ignore-for-release label
• Any Chromatic UI snapshot changes have been reviewed and approved by a designer if necessary
• Engineering has approved the PR

🎨 CSS-Library Update

• The PR has the css-library label
• vets-website and content-build have been checked to determine the impact of any breaking changes
• Engineering has approved the PR