refactor: consolidate all client install logic into single action

Renamed install-client-for-release to install-llama-stack-client and
made it handle both release branches and client-version inputs. Now
all client installation logic lives in one place:

- Release branches: always install from matching git branch
- Non-release branches: install based on client-version input

This eliminates all the conditional logic from setup-runner.

.github/actions/setup-runner/action.yml

@@ -18,36 +18,19 @@ runs:
         python-version: ${{ inputs.python-version }}
         version: 0.7.6
 
-    - name: Pre-install client for release branches
-      uses: ./.github/actions/install-client-for-release
+    - name: Install llama-stack-client
+      uses: ./.github/actions/install-llama-stack-client
+      with:
+        client-version: ${{ inputs.client-version }}
 
     - name: Install dependencies
       shell: bash
       run: |
-        # Determine the branch we're working with (needed for post-install logic)
-        BRANCH="${{ github.base_ref || github.ref }}"
-        BRANCH="${BRANCH#refs/heads/}"
-
         echo "Updating project dependencies via uv sync"
         uv sync --all-groups
 
         echo "Installing ad-hoc dependencies"
         uv pip install faiss-cpu
 
-        # Install llama-stack-client-python based on the client-version input
-        # Only applies to non-release branches (on release branches, we already installed from git above)
-        if [[ ! "$BRANCH" =~ ^release-[0-9]+\.[0-9]+\.x$ ]]; then
-          if [ "${{ inputs.client-version }}" = "latest" ]; then
-            echo "Installing latest llama-stack-client-python from main branch"
-            uv pip install git+https://github.com/llamastack/llama-stack-client-python.git@main
-          elif [ "${{ inputs.client-version }}" = "published" ]; then
-            echo "Installing published llama-stack-client-python from PyPI"
-            uv pip install llama-stack-client
-          else
-            echo "Invalid client-version: ${{ inputs.client-version }}"
-            exit 1
-          fi
-        fi
-
         echo "Installed llama packages"
         uv pip list | grep llama