add error validation to executors for executor_queue_name env var
Created by: DaedalusG
Resolves https://github.com/sourcegraph/sourcegraph/issues/41089
Test plan
Tested Locally with env EXECUTOR_QUEUE_NAME=prod-codeintel sg start codeintel
Created by: DaedalusG
Resolves https://github.com/sourcegraph/sourcegraph/issues/41089
Tested Locally with env EXECUTOR_QUEUE_NAME=prod-codeintel sg start codeintel