DX12 `draw_multiview` tests fail on Arc/Windows

[cwfitzgerald]

Discovered in #8610 (comment)

        FAIL [   1.023s] wgpu-test::wgpu-gpu [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_noncontiguous
ΓöÇΓöÇΓöÇΓöÇ STDOUT:             wgpu-test::wgpu-gpu [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_noncontiguous

running 1 test
test [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_noncontiguous ... FAILED

failures:

---- [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_noncontiguous ----
test panicked: tests\tests\wgpu-gpu\multiview\mod.rs:39:61: test "wgpu_gpu::multiview::draw_multiview_noncontiguous" did not behave as expected


failures:
    [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_noncontiguous

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 1023 filtered out; finished in 0.87s

ΓöÇΓöÇΓöÇΓöÇ STDERR:             wgpu-test::wgpu-gpu [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_noncontiguous

thread '<unnamed>' panicked at tests\tests\wgpu-gpu\multiview\mod.rs:191:9:
assertion `left == right` failed: Expected 0
  left: Some(96)
 right: None
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[2025-12-03T19:10:00Z ERROR wgpu_test::expectations] Panic: assertion `left == right` failed: Expected 0
      left: Some(96)
     right: None

thread '<unnamed>' panicked at tests\src\run.rs:121:9:
tests\tests\wgpu-gpu\multiview\mod.rs:39:61: test "wgpu_gpu::multiview::draw_multiview_noncontiguous" did not behave as expected

        FAIL [   1.025s] wgpu-test::wgpu-gpu [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_single
ΓöÇΓöÇΓöÇΓöÇ STDOUT:             wgpu-test::wgpu-gpu [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_single

running 1 test
test [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_single ... FAILED

failures:

---- [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_single ----
test panicked: tests\tests\wgpu-gpu\multiview\mod.rs:15:54: test "wgpu_gpu::multiview::draw_multiview_single" did not behave as expected


failures:
    [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_single

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 1023 filtered out; finished in 0.87s

ΓöÇΓöÇΓöÇΓöÇ STDERR:             wgpu-test::wgpu-gpu [Executed] [Dx12/Intel(R) Arc(TM) Graphics/1] wgpu_gpu::multiview::draw_multiview_single

thread '<unnamed>' panicked at tests\tests\wgpu-gpu\multiview\mod.rs:191:9:
assertion `left == right` failed: Expected 32
  left: Some(255)
 right: None
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[2025-12-03T19:10:01Z ERROR wgpu_test::expectations] Panic: assertion `left == right` failed: Expected 32
      left: Some(255)
     right: None

thread '<unnamed>' panicked at tests\src\run.rs:121:9:
tests\tests\wgpu-gpu\multiview\mod.rs:15:54: test "wgpu_gpu::multiview::draw_multiview_single" did not behave as expected