[wire] Update wire to remove remaining spanification remnants.

- Removes the remaining support for blocklisting spanification
  in the wire after updating the remaining paths that required
  fixed-extent Spans now that they are available.
- There are still some vestiges of the spanification notably
  in WireCmd.cpp where because the Cmds are using C structs
  we cannot spanify them entirely yet because serializing
  and deserialization of the raw C structs still require
  directly reading/writing to the pointers.
- This will be addressed in a follow up where I am going to
  try to generated a Dawn level version of the
  wgpu_structs_autogen.h file that doesn't convert the C
  types to implementation specific types, but does spanify
  the structs and relevant members. Implementations can then
  provide an additional namespace specific override of the
  structs that further refine the types to the implementations,
  specifying ToAPI and FromAPI helpers in a respective
  dawn_platform.h generated file.

Bug: 526537254
Change-Id: If461c05fd8dd9c1433f796b8a25d1248f4686291
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/330035
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Loko Kung <lokokung@google.com>