fix: multiple issues with getting_started notebook (#1795)

Fixes multiple issues 

1. llama stack build of dependencies was breaking with incompatible
numpy / pandas when importing datasets

Moved the notebook to start a local server instead of using library as a
client. This way the setup is cleaner since its all contained and by
using `uv run --with` we can test both the server setup process too in
CI and release time.

2. The change to [1] surfaced some other issues 
- running `llama stack run` was defaulting to conda env name 
- provider data was not being managed properly 
- Some notebook cells (telemetry for evals) were not updated with latest
changes

Fixed all the issues and update the notebook. 

### Test 

1. Manually run it all in local env 
2. `pytest -v -s --nbval-lax docs/getting_started.ipynb`

llama_stack/distribution/start_stack.sh

@@ -13,6 +13,7 @@ LLAMA_CHECKPOINT_DIR=${LLAMA_CHECKPOINT_DIR:-}
 LLAMA_STACK_DIR=${LLAMA_STACK_DIR:-}
 TEST_PYPI_VERSION=${TEST_PYPI_VERSION:-}
 PYPI_VERSION=${PYPI_VERSION:-}
+VIRTUAL_ENV=${VIRTUAL_ENV:-}
 
 set -euo pipefail
 
@@ -69,22 +70,25 @@ while [[ $# -gt 0 ]]; do
     ;;
   esac
 done
-
 PYTHON_BINARY="python"
 case "$env_type" in
   "venv")
-    # Activate virtual environment
-    if [ ! -d "$env_path_or_name" ]; then
-        echo -e "${RED}Error: Virtual environment not found at $env_path_or_name${NC}" >&2
-        exit 1
-    fi
+    if [ -n "$VIRTUAL_ENV" && "$VIRTUAL_ENV" == "$env_path_or_name" ]; then
+        echo -e "${GREEN}Virtual environment already activated${NC}" >&2
+    else
+        # Activate virtual environment
+        if [ ! -d "$env_path_or_name" ]; then
+            echo -e "${RED}Error: Virtual environment not found at $env_path_or_name${NC}" >&2
+            exit 1
+        fi
 
-    if [ ! -f "$env_path_or_name/bin/activate" ]; then
-        echo -e "${RED}Error: Virtual environment activate binary not found at $env_path_or_name/bin/activate" >&2
-        exit 1
-    fi
+        if [ ! -f "$env_path_or_name/bin/activate" ]; then
+            echo -e "${RED}Error: Virtual environment activate binary not found at $env_path_or_name/bin/activate" >&2
+            exit 1
+        fi
 
-    source "$env_path_or_name/bin/activate"
+        source "$env_path_or_name/bin/activate"
+    fi
     ;;
   "conda")
     if ! is_command_available conda; then