Use data attr instead of HTML id

Problem/Motivation

When paragraph template has the id attribute defined and not only containing the number, eg. 'paragraph--ID', layout paragraphs builder control will not appear. Because it is depending on the id attribute to attach control, which is looking for 'ID' alone.

Steps to reproduce

Add paragraph.html.twig, customize to have a paragraph ID.

...
{% set paragraph_id = 'paragraph--' ~ paragraph.id.value %}
<div{{ attributes.addClass(classes).setAttribute('id', paragraph_id) }}>
...
</div>

Proposed resolution

Use the "data-id" attribute.

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.