Update to React Router 6

[AlanGreene]

Changes

https://github.com/tektoncd/dashboard/issues/2452

Follow the remaining steps in the migration guide to replace the compat layer with actual use of React Router 6 directly. This includes:

• move Route children into the element prop
• refactor use of the Link's component prop to the new approach
• update tests to avoid relying on history
• and more

While this does update us to React Router 6 there is still more to be done to take advantage of the new features, such as the handle prop on Routes to avoid the need for our custom NamespacedRoute component etc. This will be tackled in the near future and will dramatically simplify the code, allowing for a more uniform approach to handling Kube resources without the current overhead of custom containers per kind etc.

/kind misc

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• [ ] Docs included if any changes are user facing
• [ ] Tests included if any functionality added or changed
• [ ] Follows the commit message standard
• [ ] Meets the Tekton contributor standards (including functionality, content, code)
• [ ] Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• [ ] Release notes block below has been updated with any user facing changes (new features, significant UI changes, API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• [ ] Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

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