Use strong_parameters for RefsController

What does this MR do and why?

• Contributes to #351520 (closed)
• Sentry error: https://sentry.gitlab.net/gitlab/gitlabcom/issues/3182017

It applies StrongParameters check for RefsController input values

How to set up and validate locally

Following link should work without a 500 error: http://127.0.0.1:3000/flightjs/Flight/-/refs/master/logs_tree?format=json&offset[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.