[CLI-2061, CLI-2062] Add --environment flag to api-key list, improve wrong env error

[Brian Strauch (brianstrauch)]

Checklist

1. [CRUCIAL] Is the change for CP or CCloud functionalities that are already live in prod?
   • yes: ok

What

When using a --resource not part of the current environment, the user used to see:

Forbidden Access: 403 Forbidden

This error has been improved with suggestions:

Error: Kafka cluster not found or access forbidden: Forbidden Access: 403 Forbidden

Suggestions:
    Ensure the cluster ID you entered is valid.
    Ensure the cluster you are specifying belongs to the currently selected environment with `confluent kafka cluster list`, `confluent environment list`, and `confluent environment use`.

At this point, the user can use --environment to choose the right environment.

References

CLI-2061
CLI-2062

Test & Review

Manually tested, all tests still pass

[Steven Gagniere (sgagniere)]

lgtm!