Fix Diff for New Project Change Requests

[Peyton-McKee]

Changes

useGetSingleProject will throw an error if the project isnt found, so instead I created a new page that doesnt call that hook if its a change request made off of a car. Also fixed a bug where change requests on car read undefined - fergus.

Screenshots

Checklist

It can be helpful to check the Checks and Files changed tabs.
Please review the contributor guide and reach out to your Tech Lead if anything is unclear.
Please request reviewers and ping on slack only after you've gone through this whole checklist.

• All commits are tagged with the ticket number
• No linting errors / newline at end of file warnings
• All code follows repository-configured prettier formatting
• No merge conflicts
• All checks passing
• Screenshots of UI changes (see Screenshots section)
• Remove any non-applicable sections of this template
• Assign the PR to yourself
• No yarn.lock changes (unless dependencies have changed)
• Request reviewers & ping on Slack
• PR is linked to the ticket (fill in the closes line below)

Closes # (issue #)