UHF-9126 fix false positives

[dire]

UHF-9126

The visual regression tests failed even though nothing had really changed.

What was done

• Removed the iframes, since it doesn't make sense to test external content.
• Fixed the selector of announcements.
• Tweaked the testing of the text component, earlier only the first heading was tested and it wasn't so useful in my opinion.

How to install

• Make sure your platform test instance is up and running on latest dev branch.
  • git pull origin dev
  • make fresh
• Update the HDBT theme
  • composer require drupal/hdbt:dev-UHF-9126_fix-false-positives
• Run make drush-cr

How to run the tests

Run these commands inside the HDBT theme root.

• Run npm run fast-reference
• Run npm run fast-test
• Check the results at https://platform-test.docker.so/themes/contrib/hdbt/backstop_data/fast/html_report/index.html

How to test

• Check that no tests fail if no changes were made.
• Check that code follows our standards

Note: There is a problem currently with TPR units. I created a separate ticket for that.

[teroelonen]

This works now on the parts that it promised to work 🦖