fix: Handle no projects available

[Lms24]

This PR handles the uncaught crash when a user chose to log in but didn't yet create a project. In this case, we now print a message instructing users to create a new project first and then try running the wizard again.

I refactored all our clack-based wizards to use the getOrAskForProjectData helper so that we only have to handle this once.

For the Step-based wizards, I adjusted the error message with better instructions.

closes #400

[krystofwoldrich]

Is this also an issue in the RN wizard?

[Lms24]

@krystofwoldrich good point! I checked and for RN (+ the other Step-based wizards) the SentryProjectSelector Step simply throws an error:

sentry-wizard/lib/Steps/SentryProjectSelector.ts

Lines 20 to 25 in 2f1e66a

	if (
	_.has(answers, 'wizard.projects') &&
	answers.wizard.projects.length === 0
	) {
	throw new Error('no projects');
	}

I'm just gonna add a more verbose error message but leave the rest as is.