[2.0.0-beta2] Check PropTypeInterface::normalize()

Problem/Motivation

They may have some errors with attributes management in LinksPropType (for example, when used in a view pager) & AttributesPropType

For AttributesPropType at least:

Drupal\Core\Render\Component\Exception\InvalidComponentException: [attributes] String value found, but an object is required

Found in USWDS & DaisyUI themes.

Proposed resolution

Unfortunately, I was never able to reproduce those errors on my local environment. So, let's investigate fist.

ui_patterns_devel is catching those errors, so it needs to be disabled before investigation.

Careful, because Olivier is currently doing the tests of the exact same plugins: #3469665: [2.0.0-rc1] Test PropTypeInterface::normalize()

This ticket is also the opportunity to do this: #3469755: Links normalize drops link options