Revert "[wgsl] Apply array polyfills in synthetic sksl tests correctly"

This reverts commit 0d60c01b23a6e43eea2652cf20a72c511a5b4174.

Reason for revert: ../../../../../skia/src/sksl/codegen/SkSLWGSLCodeGenerator.cpp:1153: fatal error: "check(var.storage() == VariableStorage::kGlobal)"


Original change's description:
> [wgsl] Apply array polyfills in synthetic sksl tests correctly
>
> This refactors `writeUniformsAndBuffers`'s body that handled interface
> blocks into a helper `writeInterfaceBlock` (logic unchanged) so that it
> could be called by `writeNonBlockUniformsForTests` in place of it
> generating bespoke WGSL that was 90% the same as the default generated
> interface WGSL.
>
> This allows the synthetic global uniform block to participate in the
> array polyfills and matrix polyfills correctly, although there was a
> minor impact on generated test wgsl where @group and @binding changed
> order.
>
> The array/matrix polyfill types also had to be updated to use @align(16)
> instead of @size(16). The latter adjusts the size but does not propagate
> the stricter alignment into any wrapping type.
>
> Bug: b/465408252
> Change-Id: I41077f77ff8bd752f20c8e0f7603bfd4023a45cf
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1121416
> Commit-Queue: Michael Ludwig <michaelludwig@google.com>
> Reviewed-by: Thomas Smith <thomsmit@google.com>

Bug: b/465408252
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: Ie940e21f5391ffe87d92eb961e8a9ca932a5845b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1143596
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>