bugfix(airflowctl): handle version command exception and make tests unified

[bugraoz93]

Exception handling for ctl version, while if the API is not reachable, it will fall back to only show ctl version along with the error returned from the client, which will make debugging easier for all.

Error fetching version information: [Errno 104] Connection reset by peer
{'airflowctl_version': '1.0.0'}

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[jscheffl]

Look good.

Though I'd propose to return a non-zero exit code on error of version. At the moment it is catched and just the print is adjusted.