UHF-10570: Aria label and role for the IBM chats with JavaScript

[teroelonen]

UHF-10570

What was done

• Merge user consent functionality with chat accessibility enhancements
• Create one new library, attach it to IbmChatApp

How to install

• Make sure your instance is up and running on latest dev branch. Instances with chats can be found from here but for example asuminen or sote is good place to start.
  • git pull origin dev
  • make fresh
• Update the Helfi Platform config
  • composer require drupal/helfi_platform_config:dev-UHF-10570
• Run make drush-updb drush-cr

How to test

• Go to any instance with a IBM chat (for example asuminen or sote) and inspect the chat button that there is now the role="region" and aria-labelledby="chat-app-button" for the chat button.
• Check that the chat still works normally.
• Check that code follows our standards.

Continuous documentation

• This feature has been documented/the documentation has been updated
• This change doesn't require updates to the documentation

[annadruid]

Looks good and works as described!