feat: AMD GPU compute stress via rocm-validation-suite GST (GEMM)

- Add rocm-validation-suite, rocblas, rocrand, hip-runtime-amd,
  hipblaslt, comgr to ISO (~700MB, needed for HIP compute)
- RunAMDStressPack: run RVS GST (SGEMM ~31 TFLOPS/GPU) + bandwidth test
- Add rvs symlink in chroot setup hook
- Pin all new package versions in VERSIONS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

iso/builder/VERSIONS

@@ -12,5 +12,11 @@ DCGM_VERSION=3.3.9
 ROCM_VERSION=6.3.4
 ROCM_SMI_VERSION=7.4.0.60304-76~22.04
 ROCM_BANDWIDTH_TEST_VERSION=1.4.0.60304-76~22.04
+ROCM_VALIDATION_SUITE_VERSION=1.1.0.60304-76~22.04
+ROCBLAS_VERSION=4.3.0.60304-76~22.04
+ROCRAND_VERSION=3.2.0.60304-76~22.04
+HIP_RUNTIME_AMD_VERSION=6.3.42134.60304-76~22.04
+HIPBLASLT_VERSION=0.10.0.60304-76~22.04
+COMGR_VERSION=2.8.0.60304-76~22.04
 GO_VERSION=1.24.0
 AUDIT_VERSION=1.0.0