Initialize partially servers/rendering

[qarmin]

Part of #43636

-300 lines

[qarmin]

Hmmm....
Looks that it broke shaders when running editor in CI(or which is less likely, unexposed bug with them)

SHADER ERROR: Expected 'shader_type' at the beginning of shader. Valid types are: 'canvas_item', 'particles', 'sky', 'spatial'
          at: (null) (:15)
ERROR: Shader compilation failed.

Fixed, I removed from data from clear method instead constructor

[qarmin]

Currently I don't have enough time to rebase such commits, so feel free to use them to create new PR.