fix: do not throw error when --force is passed

[craicoverflow]

Fixes #390

This was throwing a validation error when the CLI was being running in a non-TTY environment. The fix just required an additional check for the force flag.

Verification

Run rhoas kafka delete with stdin closed and you will get an error to say interactive mode is not available:

❯ true | (setsid ./rhoas kafka delete) 2>&1 | cat
Error: --force required when not running interactively

Run it agin with --force and it will work:

❯ true | (setsid ./rhoas kafka delete -f) 2>&1 | cat
Deleting Kafka instance "ajay-test"

[wtrocki]

Works like dream!