Use Drupal's image styles to generate thumbnail

Problem/Motivation

The thumbnail generated by the Keepeek module is the full WHR file - and it distorts the UI when it is a large file.

Steps to reproduce

Select an asset where the Asset has a high resolution whr file.

Proposed resolution

Once https://www.drupal.org/project/keepeek/issues/3503622 ✨ Add integration with Drupal Image Styles Active has landed, we can use Drupal's image styles to generate a thumbnail, as per Drupal's default Image media type.

Remaining tasks

https://www.drupal.org/project/keepeek/issues/3503622 ✨ Add integration with Drupal Image Styles Active must be complete

User interface changes

n/a

API changes

n/a

Data model changes

n/a