Light themes regression in godot 4

[aganm]

Godot version

4.0+

System information

Godot v4.0+

Issue description

The light themes in godot 4 have regressed from godot 3. I expect the theme 'Solarized Light' in godot 4 to look exactly the way it looked in godot 3.

Steps to reproduce

Open godot, go to the Editor -> Editor Settings -> Interface -> Theme, and change the theme to one of the light themes, either 'Light' or 'Solarized Light'.

Minimal reproduction project

Create a brand new empty project in godot and see the solarized light theme in godot 3:

Compare it to godot 4, where the colors are overblown and the minimap has no highlight:

I opened PR #78297 to attempt fixing the overblown colors (by simply reducing the negative contrast) until I realized that the minimap hightlight was also missing.