Download larger thumbnails (1080px width) instead of default size

Problem/Motivation

Currently, the kaltura_media module downloads smaller thumbnails (default width) from Kaltura, which may not be suitable for high-resolution displays or specific design requirements. Many use cases (e.g., media galleries, featured content) would benefit from larger thumbnails (e.g., 1080px width) for better visual quality.

Steps to reproduce

1. Install and configure the kaltura_media module.
2. Upload or reference a Kaltura video.
3. Observe the downloaded thumbnail size (default is often much smaller than 1080px).

Proposed resolution

Modify the thumbnail download logic in the kaltura_media module to fetch larger thumbnails (1080px width) by default. This may involve adjusting the Kaltura API request parameters for thumbnails.

Remaining tasks

- TBD

User interface changes

- Higher resolution thumbnails on kaltura media

API changes

- None

Data model changes

- None