MNT Additional behat tests

[sabina-talipova]

Description

Additional Behat tests to test user interaction with LinField using the keyboard. Tests check the ability to create links and sort using "drag and drop".

Manual testing steps

Not required

Issues

• https://github.com/silverstripe/silverstripe-linkfield/issues/205

Pull request checklist

• [x] The target branch is correct
  • See picking the right version
• [x] All commits are relevant to the purpose of the PR (e.g. no debug statements, unrelated refactoring, or arbitrary linting)
  • Small amounts of additional linting are usually okay, but if it makes it hard to concentrate on the relevant changes, ask for the unrelated changes to be reverted, and submitted as a separate PR.
• [x] The commit messages follow our commit message guidelines
• [x] The PR follows our contribution guidelines
• [x] Code changes follow our coding conventions
• [ ] This change is covered with tests (or tests aren't necessary for this change)
• [ ] Any relevant User Help/Developer documentation is updated; for impactful changes, information is added to the changelog for the intended release
• [x] CI is green

[sabina-talipova]

Test passed: https://github.com/sabina-talipova/recipe-kitchen-sink/actions/runs/7924765855/job/21636895068

[emteknetnz]

Have merged and released behat-extenstion pr, re-running behat tests on this pr now