[Backport 10.x.x] [HDRP] Backport misc PRs (#4397)

* [HDRP] Fp16_PPAlpha Panini projection, Motion Blur test and moved other Fp16Alpha scenes to one #4290

* Hd/redo fix inputregistering domainreload (#4358)

* Update InputRegistering.cs

* Remove asset modification if InputSystem package is in use

* Prevent missuse of InputRegistering while InputSystem package is in use

* cleaning

* more cleaning

* Update code to use Next instead of GetArrayElementAtIndex

* Fix strange out of range error

Co-authored-by: TomasKiniulis <[email protected]>
Co-authored-by: Remi Slysz <[email protected]>

Author: 3 people