Automatic merge from submit-queue (batch tested with PRs 47675, 48001)
cmd/create_deployment: refactor long function
Refactor the `createDeployment` function under `pkg/kubectl/cmd`.
- [x] Behavior has been extracted to two helper functions.
- [x] Behavior remains identical.
- [x] Logic has been made explicit through function naming and comments.
This is essentially the pattern I've been following in my larger branches (the ones that are pending the merge of #46468). Want to get some design feedback before I get too far away from `master`.
Thanks!
cc @apelisse @mengqiy @droot
**Release note**:
```release-note
NONE
```
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