Completion does not work for `create job --from`

**What would you like to be added**:

Completion currently does not work at all after a `--from` flag. Immediately after the flag, it only suggests filenames (which is incorrect), and not resource types. After a resource type and a slash, it doesn't suggest anything (instead of the expected behavior of suggesting resource names)

**Why is this needed**:

`create --from` is used to manually trigger CronJobs, I'm not aware of other use cases but I'm sure they exist. It's a bit of a pain to have to do an extra `kubectl get` to get the exact name and then copy/paste or type it out, when tab completion usually enables a much faster flow