chore: run workflows on PR ready

[pwltr]

Description

Run workflows when PR state changes from 'draft' to 'ready for review'.

From https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows#pull_request

By default, a workflow only runs when a pull_request event's activity type is opened, synchronize, or reopened. To trigger workflows by different activity types, use the types keyword.

[pwltr]

Error: Action failed with error: Workflow validation failed. The workflow file must exist and have identical content to the version on the repository's default branch. If you're seeing this on a PR when you first add a code review workflow file to your repository, this is normal and you should ignore this error.

Can be ignored