Re-add fixed layout to new file browser

Sascha Eggenbergerrequested to merge
585779-file-browser-fixed-layout into master

What does this MR do and why?

Re-adds the fixed layout to new file browser

Screenshots or screen recordings

Before After
Fixed layout option
before_fixed after_fixed
Fluid layout option (no change)
before_fluid after_fluid

How to set up and validate locally

  1. Enable FF https://gdk.test:3000/rails/features/repository_file_tree_browser
  2. Set layout width option to fixed: https://gdk.test:3000/-/profile/preferences
  3. Check https://gdk.test:3000/flightjs/Flight/-/tree/master

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Closes #585779

Edited by Sascha Eggenberger

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