[Feature Request]: Notify users when stories globs didn't match any files on startup

[yannbf]

Is your feature request related to a problem? Please describe

When I was testing Storybook 7 docs, I got frustrated with the fact that I had wrong stories globs (with a typo, so the globs didn’t match anything when starting Storybook), and the CLI didn’t tell me that. I thought there was a bug with docs but it was just a typo in my stories glob.

Describe the solution you'd like

It'd be great if Storybook told me that the glob I specified, didn't match any file.

Describe alternatives you've considered

No response

Are you able to assist to bring the feature to reality?

yes, I can

Additional context

No response

[shilman]

¡Ay Caramba!! I just released https://github.com/storybookjs/storybook/releases/tag/v7.0.0-beta.63 containing PR #21392 that references this issue. Upgrade today to the @next NPM tag to try it out!

npx sb@next upgrade --prerelease