Warns about shell not officially supported

[jesperoman]

op CLI version

2.30.0

Goal or desired behavior

At least a flag to turn off the output of that warning

Current behavior

Currently, whenever I'm running the cli with the aws plugin, (in nushell) it outputs:
WARNING: is not a shell officially supported by 1Password Shell Plugins!

It interferes with the other output when using it in scripts.

Relevant log output

❯ aws s3 ls --profile ***
WARNING:  is not a shell officially supported by 1Password Shell Plugins!
...