Allows you to set the PlatformShaderSettings for the specified platform and shader hardware tier.
If the platform you are tweaking is an active build target, the shaders will reload so you can see the results immediately. If `PlatformShaderSettings` is set to tiers that are not the same, then tier variants will be generated for the shader even if `#pragma hardware_tier_variants` is missing. You can only set Graphics Tiers in the Built-in Render Pipeline.