Run no-default-groups smoke test from Justfile

Refs #842

I had to add --isolated because otherwise this test would pass if a .venv
folder already existed with the dev dependencies installed in it.

Author: simonw

Justfile

@@ -2,9 +2,12 @@
 @default: test lint
 
 # Run pytest with supplied options
-@test *options:
+@test *options: test-no-dev-dependencies
   uv run pytest {{options}}
 
+@test-no-dev-dependencies:
+  uv run --isolated --no-default-groups sqlite-utils --help > /dev/null
+
 @run *options:
   uv run -- {{options}}