Update React Router

[AlanGreene]

Blocked by #3492 as React v18 is the minimum supported version for React Router v7

See migration guide: https://reactrouter.com/upgrading/v6

This can be tackled in phases:

1. update to latest v6
2. enable all feature flags (can be split as needed)
3. update to v7 (no breaking changes)

[iamrajiv]

hi @AlanGreene can i work on this?

[AlanGreene]

Hi @iamrajiv, thanks for your interest. Yes please reach out if you have any questions, and I would strongly suggest following the phased approach above if possible to aid in easier review and testing of the changes.

/assign @iamrajiv