[Valeria-Zimnitskaya]

Cleanup of browser, axe and unit tests for components A–F, but excluded data-table, d3charts and date-picker

What changed:

• Long tests are split into test.step, including axe tests (// check {} blocks are now steps).
• Manual checks are replaced with web-first assertions
• Repeated code is moved into helpers, and unused locators and imports are removed.
• Tags: added @Mouse, @keyboard; base-trigger axe tests use @base-trigger where it was needed
• Fixed typos in test names, and renamed some tests to say more clear what they actually check.
• Duplicate tests are merged
• Some snapshots and combinations removed (unrepresentative props combinations or duplicated which are covered by others, interactions that don't depend on a prop are checked on one variant only)

Motivation and Context

How has this been tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• Nice improve.

Checklist:

• I have updated the documentation accordingly.
• I have added new tests on added of fixed functionality.