Fix some SpotLight3D issues (clustering artifacts, leaking light, AABB)

[Geometror]

• Fixes light leak to the outside of the cone, visible at certain cone angles (the leaked light changed periodically from being negative to positive, see green spot lights with slightly different spot angle in picture below)
  Fixes Vulkan Clustered: SpotLight3D clustering artifacts with no fog or other effects #70698
  Fixes Vulkan: SpotLight3D affects lighting outside of the cone #69936
  Fixes Vulkan: SpotLight3D exhibits clustering artifacts at small angle relative to the surface #68969
  Fixes Vulkan: SpotLight3D + WorldEnvironment fog causes jaggedness due to clustering issues #59262 (likely, could not test since no MRP was provided)
  (These basically boil down to the same bug: no clustering issue, but since the light leaks in directions where the cluster builder doesn't expect it to be it looks blocky; its also visible in the mobile renderer)
  Cause: Bisected to More fixes to mobile renderer #51843. Seems to be a precision issue, changing the precision of cone_angle from mediump to highp in the LightData struct (light_data_inc.glsl) also fixes the issue, but I went with converting cone_angle to a highp float inside the shader so the struct size doesn't have to be increased.

• Fixes AABB generation
  The wrong trigonometric function was used, so the AABB would grow towards infinity for angles close to 90 degrees. For angles above 90 degrees a box enclosing the whole sphere (radius = range) is generated.

• Fixes clustering for angles close to and above 90 degrees
  Fixes Vulkan: SpotLight3D angles above 90 degrees cause clustering artifacts (even with shadows disabled) #48054
  Introduces a threshold constant: the angle above which the cluster builder uses a sphere instead of a cone (see comment in code).

Before

With this PR

[clayjohn]

Just a little style nitpick. Otherwise the PR looks good!

Tested locally using an Nvidia GPU which could reproduce the listed issues. This PR fixes the issues

[akien-mga]

Thanks!