ci: add prerelease workflows

[angeloashmore]

Resolves: N/A

Description

This PR adds the PR and canary prerelease workflows from https://github.com/prismicio/prismic-typescript-template

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

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