chore: move benchmarking related code (#3406)

# What does this PR do?
- moving things and some formatting changes


## Test Plan

benchmarking/k8s-benchmark/apply.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the terms described in the LICENSE file in
+# the root directory of this source tree.
+
+# Deploys the benchmark-specific components on top of the base k8s deployment (../k8s/apply.sh).
+
+export STREAM_DELAY_SECONDS=0.005
+
+export POSTGRES_USER=llamastack
+export POSTGRES_DB=llamastack
+export POSTGRES_PASSWORD=llamastack
+
+export INFERENCE_MODEL=meta-llama/Llama-3.2-3B-Instruct
+export SAFETY_MODEL=meta-llama/Llama-Guard-3-1B
+
+export MOCK_INFERENCE_MODEL=mock-inference
+
+export MOCK_INFERENCE_URL=openai-mock-service:8080
+
+export BENCHMARK_INFERENCE_MODEL=$INFERENCE_MODEL
+
+set -euo pipefail
+set -x
+
+# Deploy benchmark-specific components
+kubectl create configmap llama-stack-config --from-file=stack_run_config.yaml \
+  --dry-run=client -o yaml > stack-configmap.yaml
+
+kubectl apply --validate=false -f stack-configmap.yaml
+
+# Deploy our custom llama stack server (overriding the base one)
+envsubst < stack-k8s.yaml.template | kubectl apply --validate=false -f -