non-interactive ziti edge login --ca always fails if mgmt cert is trusted by OS

[qrkourier]

ziti edge login with the --ca option always fails when run non-interactively if the OS happens to be configured to trust the mgmt API server certificate by way of system-wide trust store(s).

The --yes option will override the interactive y/n prompt that's presented in https://github.com/openziti/ziti/blob/main/ziti/cmd/edge/login.go#L276, but this has the undesirable effect of also trusting malicious server certificates.

It doesn't seem useful to guard against the scenario where the mgmt API server cert happens to be trusted more than once, e.g., by the OS trust store and by the trust bundle specified in the --ca option, and this confirmation prompt always breaks non-interactive login when that is the case.