Draft: Keep user on same page when modifying feature flag

Laura Callahanrequested to merge
390611-feature_flag_no_redirect into master

What does this MR do and why?

Proof of concept for keeping users on the same feature flag page when they hit Save Changes Screenshot_2023-02-06_at_2.56.44_PM

MR acceptance checklist

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

Related to #390611

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