USF-3819: PLP Pre-rendering

[rossbrandon]

Add PLP pre-rendering support for both ACO and ACCS.

Note: This logic renders the only first page of a category if it is paginated.

Tickets

USF-3819
USF-3834

Changes

• Add render-all-categories action to execute pre-rendering of PLPs for each defined category.
• Add necessary category queries to retrieve category metadata.
• Add PLP_PRODUCTS_PER_PAGE input to define how many products are rendered on each PLP. Default is 9.
• Add plp-renderer directory (including one-off action to render a specific category slug) that includes PLP handlebar templates and html rendering, preview, and publishing logic.
• Refactor html rendering logic for reuse in both PDP and PLP cases.
• Add Prettier for code style consistency.
• Improve end-to-end tests.
• Update README and Customization/Runbook documentation.

[keoko]

LGTM!