disable awfully-slow Dilithium/ML-DSA KAT tests for 'valgrind' #69

Job	Run time
TLS-Anvil (server)	2m 4s
clang-tidy	2m 5s
PQ/T TLS 1.3	1m 20s
Sanitizers (sanitizer, msvc, windows-2022, ninja)	1m 49s
Sanitizers (sanitizer, gcc, ubuntu-24.04)	2m 5s
valgrind (clang, -O0)	25s
Cross (cross-alpha, gcc, ubuntu-24.04)	2m 3s
Cross (cross-hppa64, gcc, ubuntu-24.04)	1m 10s
valgrind (clang, -O1)	1m 26s
Cross (cross-m68k, gcc, ubuntu-24.04)	57s
valgrind (clang, -O2)	1m 16s
Cross (cross-mips, gcc, ubuntu-24.04)	53s
valgrind (clang, -O3)	1m 30s
valgrind (clang, -Os)	59s
valgrind (gcc, -O0)	1m 2s
Cross (cross-ppc32, gcc, ubuntu-24.04)	47s
valgrind (gcc, -O1)	1m 9s
Cross (cross-sh4, gcc, ubuntu-24.04)	25s
valgrind (gcc, -O2)	45s
valgrind (gcc, -O3)	45s
Cross (cross-sparc64, gcc, ubuntu-24.04)	31s
valgrind (gcc, -Os)	1m 1s
Cross (cross-riscv64, gcc, ubuntu-24.04)	46s
Cross (cross-s390x, gcc, ubuntu-24.04)	37s
Cross (cross-android-arm64-amalgamation, clang, ubuntu-24.04)	2m 2s
Cross (cross-arm64-amalgamation, gcc, ubuntu-24.04)	1m 11s
Cross (emscripten, emcc, macos-14)	1m 34s
Cross (sde, gcc, ubuntu-24.04)	24s
	33m 1s

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