chore!: remove --env from llama stack run (#3711)

# What does this PR do?
user can simply set env vars in the beginning of the command.`FOO=BAR
llama stack run ...`

## Test Plan
Run
TELEMETRY_SINKS=coneol uv run --with llama-stack llama stack build
--distro=starter --image-type=venv --run




---
[//]: # (BEGIN SAPLING FOOTER)
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[ReviewStack](https://reviewstack.dev/llamastack/llama-stack/pull/3711).
* #3714
* __->__ #3711

scripts/integration-tests.sh

@@ -186,7 +186,7 @@ if [[ "$STACK_CONFIG" == *"server:"* ]]; then
         echo "Llama Stack Server is already running, skipping start"
     else
         echo "=== Starting Llama Stack Server ==="
-        nohup llama stack run ci-tests --image-type venv > server.log 2>&1 &
+        nohup llama stack run ci-tests > server.log 2>&1 &
 
         echo "Waiting for Llama Stack Server to start..."
         for i in {1..30}; do