cody: auto signin with app

[abeatrix]

Sign in user automatically when:

• cody is able to find app token
• app is running
• not signed into another instance when cody starts

it also stores the token from the local file to secret storage automatically when found

Test plan

See Loom:

Cody.App.__.Editor.Auth.Flow.-.app.json.mp4

1. Add Cody.experimental.app.connect = true in your vs code user settings.json
2. start app and and get token from app
3. create the app.json file manually (mimic the file that will be created by app when it's ready)
4. reload VS Code, you should now be signed in automatically (you will see email verification error which will be removed next week)

[sourcegraph-bot]

📖 Storybook live preview

[chwarwick]

Yesterday's app release includes the app.json file

I tested against that version and it was very smooth.

One nit was when App was installed but not running, it properly told me, but the start app option was the last one, felt like that should have been since it knew that I had app.

When pressing the Open App button I landed here in app which I was surprised by @marekweb is this the generate a new token page? Maybe we can adjust that deep link because I don't think that should be necessary

[chwarwick]

I tested against the latest app version and 👍 it was really smooth just opened right up and ready to go.

The "open app if not running" flow requires a click in App which I don't think should be necessary, so there is probably something there to work out maybe App needs another deep link that just returns right back to the extension.

[chwarwick]

Just a reminder we should add the linux paths here too

[abeatrix]

@chwarwick the login page you're seeing is the old one so it has three options. The new login page is hidden behind a flag but if you set Cody.experimental.app.connect to true in your vs code user settings and reload vs code again, you should be able see the new page with only app as an option 😀