llama: end-to-end tests (#19802)

* tests: add end-to-end tests per model architecture

* fixup for rebase

* fix use-after-free in llama-model-loader.cpp

* fix CI

* fix WebGPU

* fix CI

* disable CI for macOS-latest-cmake-arm64

* use expert_weights_scale only if != 0.0f

* comments

scripts/git-bisect-run.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+cmake_args=()
+llama_results_args=()
+
+for arg in "${@}"; do
+    if [[ "$arg" == -D* ]]; then
+        cmake_args+=("$arg")
+    else
+        llama_results_args+=("$arg")
+    fi
+done
+
+dir="build-bisect"
+rm -rf ${dir} > /dev/null
+cmake -B ${dir} -S . ${cmake_args} > /dev/null
+cmake --build ${dir} -t llama-results -j $(nproc) > /dev/null
+${dir}/bin/llama-results "${llama_results_args[@]}"