[UNO-817] Paragraph view mode theme suggestion

[orakili]

Refs: UNO-817

This does 2 things:

It adds a theme suggestion to have more granularity with the templates for the paragraph with a view mode field.

So for example, one could create a paragraph--reliefweb-river--preview--resources.html.twig template for "reliefweb river" paragraph types with the "resources" view mode to use when displayed in the form ("preview" view mode).

It also adds a class in the claro subtheme's "reliefweb river" paragraph template to help with the styling:

Note: the class addition above applies to all the reliefweb river paragraphs. To only add the class to the resources view mode, one can create a paragraph--reliefweb-river--preview--resources.html.twig in the claro subtheme and copy the code from paragraph--reliefweb-river.html.twig and remove the change from 8b07054.

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PHP 8.2.14 (cli) (built: Dec 21 2023 20:19:50) (NTS) Copyright (c) The PHP Group Zend Engine v4.2.14, Copyright (c) Zend Technologies with Zend OPcache v8.2.14, Copyright (c), by Zend Technologies with Xdebug v3.3.0, Copyright (c) 2002-2023, by Derick Rethans Composer version 2.6.6 2023-12-08 18:32:26

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Pusher: @orakili, Action: pull_request, Workflow: Run tests

[left23]

Great, thanks! I'll leave the more generic override in place for all rivers, as it augments the UI in all cases.