UHF-8211: Common error message for react searches

[Jussiles]

UHF-8211

What was done

• Update common error message
• Add common error component to linkedevents and school search
• Refactor LoadingSpinner to use common loading spinner component
• Cleaning

How to install

• You need to have the following instance:
  • https://github.com/City-of-Helsinki/drupal-helfi-kasvatus-koulutus
  • git pull origin dev
  • make fresh
• Update the HDBT theme
  • composer require drupal/hdbt:dev-UHF-8211-common-error-message-for-react-searches
• Run make drush-cr

How to test

• Create a page with School search and check that the search is working
• Go to the root of Kasko project and run docker stop helfi-kasko-elastic to stop Elastic
• Refresh the page you created
• Check that School search error message is looking good and it's translated
• Check that loading spinner looks good. From Chromes network tab you can mock Fast 3G or Slow 3G connection to see the loading spinner
• Check that code follows our standards

[dire]

This seems fine. Translations didn't work for me for reason x, but they shouldn't break because of this.