Normals for StandardMaterial when using prepass don't match without prepass.

[DGriffin91]

Bevy version

d115828

Normals for the StandardMaterial when the prepass is used don't have the same values as when the prepass is not used.

Without prepass:

With prepass:

Without prepass:

With prepass:

[DGriffin91]

Parallax mapping is also broken with the prepass. I'm guessing the issue is related.

Without Prepass:

With Prepass:

[JMS55]

The parallax mapping issue at least seems to be caused by the normal prepass not accounting for parallax mapping. Same for the depth prepass #8486, as well as motion vectors. Skinning has the same issue, but only for motion vectors.

While the prepass output isn't matching the main pass, the reason it affects the main pass is due to #8231.

[alice-i-cecile]

Fixed by #8890.