Fixed an issue which could cause the background camera texture to stop functioning correctly on certain devices running OpenGLES3.
Previously, when using LWRP or UniversalRP, the requested culling mode was ignored. This resulted in an incorrect culling mode when using the front facing camera with ARCore (e.g., during face detection). This has been fixed.
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Breaking Changes
The following virtual methods on the `ARCameraBackground` have been removed:
Previously, `ConfigureLegacyRenderPipelineBackgroundRendering` configured a `CommandBuffer` and added the command buffer to the camera. If you had overriden this method previously, you can override the `legacyCameraEvents` property to specify the camera events which use the CommandBuffer, and `ConfigureLegacyCommandBuffer(CommandBuffer)` to configure the command buffer. There is no need to override `TeardownLegacyRenderPipelineBackgroundRendering` anymore because the `ARCameraBackground` remembers which `CameraEvent`s the buffer was added to so it can remove them later.
