Revert "Merge branch 'upgrade-flipper' into 'master'"

What does this MR do and why?

We're seeing odd issues with feature flags in production (gitlab-com/gl-infra/production#7614 (closed)), and the Flipper upgrade in !95087 (merged) may be the culprit.

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.