Issue boards: Fix a11y issues

Sascha Eggenbergerrequested to merge
issue-boards-a11y-fixes into master

What does this MR do and why?

Issue boards: Fix a11y issues

  • Adds hidden page title
  • Fixes heading level order
  • Fixes ul issues

Screenshots or screen recordings

Before After
issues fixed
before after

How to set up and validate locally

  1. https://gdk.test:3000/flightjs/Flight/-/boards

MR acceptance checklist

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Related to #513102 (closed)

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