This PR sets up Danger to check PR titles for consistency, using [`danger-plugin-pr-hygiene`](https://github.com/maxdeviant/danger-plugin-pr-hygiene). <img width="919" alt="Screenshot 2024-06-14 at 11 16 31 AM" src="https://github.com/zed-industries/zed/assets/1486634/167fe698-2505-422b-8e41-e121d9fe933f"> Release Notes: - N/A
This PR upgrades Danger to use pnpm v9. Release Notes: - N/A
This PR sets up [Danger](https://danger.systems/js/) to help us codify some of our PR rules. As an initial rule, Danger will check to ensure that every PR has a `Release Notes` section: <img width="943" alt="Screenshot 2024-01-29 at 11 50 12 AM" src="https://github.com/zed-industries/zed/assets/1486634/4d56e759-e72f-4bc0-8e74-42c55e2e6888"> Release Notes: - N/A