test(rt): pick hit-shader descriptors from the heap by a runtime index

On NVIDIA 610.43.02, selecting a descriptor-heap descriptor with a
runtime index in a hit shader lost the device, for storage buffers and
sampled images alike, which is why the examples use spec constants
there. HeapDynamicIndexHit renders two instances whose closest-hit picks
a buffer and a texture by a runtime index: one instance uses the same
set across every wave, the other a different set in every other pixel
column, so neighbouring lanes select different descriptors. It passes
on 615.78.08 and on llvmpipe.

On NVIDIA drivers older than 615.78.08 it skips rather than abort the
suite. With validation on it also renders in a child process with
validation off, since GPU-assisted validation hides the fault.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/HeapDynamicIndexHit/dynidx-miss.glsl

@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: LGPL-3.0-only
+//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
+
+#version 460
+#extension GL_EXT_ray_tracing : enable
+
+layout(location = 0) rayPayloadInEXT vec3 hitValue;
+
+void main() {
+    hitValue = vec3(0.0, 0.0, 1.0);
+}