fix: allow CLI group help without config

[Saithej2k]

Summary

• Skip config loading for nested CLI help requests such as connectors job --help.
• Update the missing-config message for real commands to point users at connectors login.

Testing

• git diff --check

Closes #3700

[cla-checker-service]

💚 CLA has been signed

[Jan-Kazlouski-elastic]

Hello @Saithej2k
Thank you for your contribution. Could you please sign the Contributor License Agreement so that we could continue with CI and review?

[Jan-Kazlouski-elastic]

buildkite test this

[Saithej2k]

buildkite build this

[Saithej2k]

buildkite build this

[Jan-Kazlouski-elastic]

Thanks for the contribution, @Saithej2k! Unfortunately this only fixes <group> --help — nested help like connectors job start --help still fails, since the group callback runs ensure_config before Click processes the leaf command's --help. Also, is_help_request() is effectively dead code (ctx.args is empty in the parent callback, so it always returns False).

[Saithej2k]

Thanks for the review. I addressed both points in #4150: configuration now loads only when a leaf command callback runs, and the tests cover every nested help route, including job start --help. I opened the corrected change as a focused follow-up because this PR was already closed.