fix: using shorebird login with an account that does not exist suggests to use shorebird account create

[nilsreichardt]

Description

When using shorebird login and logging with an account that does not exist, you get the following error message:

$ shorebird login
The Shorebird CLI needs your authorization to manage apps, releases, and patches on your behalf.

In a browser, visit this URL to log in:

https://accounts.google.com/o/oauth2/v2/auth?...

Waiting for your authorization...
We could not find a Shorebird account for [EMAIL].
If you have not yet created an account, you can do so by running "shorebird account create". If you believe this is an error, please reach out to us via Discord, we're happy to help!

However, the command shorebird account create does not exist anymore:

$ shorebird account create
Could not find a subcommand named "create" for "shorebird account".

Steps To Reproduce

1. Enter shorebird login
2. Use a Google account that is not a Shorebird account yet
3. See error

Expected Behavior

It would suggest me a way that works, like using the web.

Screenshots

No screenshots.

Additional Context

$ shorebird --version
Shorebird 0.14.6 • git@github.com:shorebirdtech/shorebird.git
Flutter 3.13.2 • revision 9486b6431e6c808c4e131f134b5d88017b3c32ab
Engine • revision e7bdf38443dff65d64446d6ca4074a35a587c770