Use StrongParameters for ProjectsController

What does this MR do and why?

• Contributes to #351520 (closed)
• Sentry error: https://sentry.gitlab.net/gitlab/gitlabcom/issues/3161990
• Feature flag: #352251 (closed)

Uses strong parameters for ProjectsController#refs

How to set up and validate locally

Following link should not return a 500 error

http://127.0.0.1:3000/flightjs/Flight/refs?find[]=branches&search[test]=test

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.