UI: Various theme fixes related to contrast
* Animation channels (Fixes T92612)
* Curve widget (Fixes T92595)
* Pie menu (Fixes T92590)
* Radio and toggle buttons background
* Checkbox background
* Fix highlighted marker name on Dopesheet (text highlight on Dopesheet)
#### Master
{F11697667, size=full}
#### This Patch
{F11697669, size=full}
{F11697849, size=full}
{F11697833, size=full}
{F11697852, size=full}
Reviewed By: #user_interface, campbellbarton, Severin
Maniphest Tasks: T92595, T92612, T92590
Differential Revision: https://developer.blender.org/D13087
# Conflicts:
# source/blender/blenkernel/BKE_blender_version.h
e65230f0c0