Allow default color mode to be set

What does this MR do and why?

Reads config for default color mode from gitlab.yml rather than setting to 1

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

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

light dark auto
Screenshot_2024-07-31_at_16.38.29 Screenshot_2024-07-31_at_16.39.21 Screen_Recording_2024-07-31_at_16.42.56

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

  1. in config/gitlab.yml on like 31, add default_color_mode: 2 (1 for light mode, 2 for dark and 3 for automatic)
  2. run gdk restart
  3. view login screen by logging out of current user

Related to #454727 (closed)

Edited by James Rushford

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