Specifying --templateId should not require to specify --imageName

[jonbesga]

When defining the template in the Runpod UI we already specify imageName. The --imageName parameter should not be required when trying to create a pod from the CLI.

[dxqb]

it's in the underlying GraphQL, probably used by both runpodcrtl and runpod-python. runpod-python report here: https://github.com/runpod/runpod-python/issues/385