meta: Include mkhl.direnv in the recommended vscode extension list (#67231)
This is needed so vscode picks up env vars when it runs commands like
linters in the background, things that direnv pick up and normally
people don't think about.
It's especially needed by getsentry which uses an env var to find the
sentry repo on your machine and run src/sentry/lint/engine.py across
repos. Included here in sentry to keep parity between the settings.
Ryan Albrecht