[PLAY-1391] Add Category to Playbook kit generator

[ElisaShapiro]

What does this PR do? A clear and concise description with your runway ticket url.
PLAY-1391 adds the capability to use a category flag when creating a new kit with the Playbook kit generator that allows for the newly generated kit to be sorted into one of the preexisting categories (aka submenus with in Components on the sidebar). This feature does not allow for the generation of new categories via this generator (creating new categories is a rare occurrence and should be done manually) and it is optional (when a kit is generated with a category flag, it will function like it is currently and just be appended to the bottom of the menu.yml).

This ticket is a follow up following an initial investigation done during PLAY-1330 which fixed the Fix generator and updated its documentation. New information about the Category prop will be added to the Generating a Kit huddle doc once this is approved (the draft is here with doc changes pending approval).

Screenshots: Screenshots to visualize your addition/change
Example Uno: adding a new kit with a typo in the category, then successfully doing so once fixed

Example dos: adding a new kit with a category and a kit type

Example tres: adding a new kit without a category specified

Example quatro: adding a new kit with kit type, props, and category specified

How to test? Steps to confirm the desired behavior:

1. Pull down this branch.
2. Reference the generating a kit documentation to try to add a kit with a category (see draft linked above if huddle doc not yet updated).
3. New kit should be added to menu.yml file and visible on the PB website locally when you start the server and check localhost.
4. Try to add a kit omitting a category (and see it append to the bottom of menu.yml like it did previously; try to mess up the category name (with a typo or a category that doesn't exist) and see the generator stall out.

ALTERNATIVE:
Reference demo video in Runway ticket.

Checklist:

• LABELS Add a label: enhancement, bug, improvement, new kit, deprecated, or breaking. See Changelog & Labels for details.
• DEPLOY I have added the milano label to show I'm ready for a review.
  - [ ] TESTS I have added test coverage to my code.