[REFACTOR] Refactor methods for linting due to cognitive complexity

This issue is created to follow up on: https://github.com/ewcloud/ewccli/pull/108#issue-4428051729

The following methods needs refactoring:

CFQ002, CCR001 -> high cognitive complexity

**hub_backends.py**
- [ ] get_hub_item_env_variable_value
- [ ] run_ansible_item
- [ ] run_ansible_playbook_item

**hub_command.py**
- [ ] categorize_item_inputs
- [ ] validate_item_input_types
- [ ] deploy_cmd

**hub_utils.py**
- [ ] verify_item_is_deployable

**commons_infra.py**
- [ ] check_server_conflict_with_inputs
- [ ] normalize_os_image
- [ ] resolve_image_and_flavor
- [ ] resolve_machine_ip
- [ ] get_deployed_server_info
- [ ] list_server_details
- [ ] pre_deploy_server_setup
- [ ] identify_server_reconfiguration
- [ ] deploy_server
- [ ] post_deploy_server_setup
- [ ] create_server_command

**login_command.py**
- [ ] _resolve_openstack_credentials

Start with the follow-up context in pull request 108, then inspect the listed methods across hub_backends.py, hub_command.py, hub_utils.py, commons_infra.py, and login_command.py. Run the project's lint checks to identify the CFQ002 and CCR001 findings for each method. Done means all listed methods have been refactored so those cognitive-complexity lint findings are resolved.

Written by the indexing model from the issue text.