feat: upgrade react router to v6

[Syed-Ali-Abbas-Zaidi]

Ticket

React Router Upgrade to v6.

Description

This PR upgrades React Router from v5 to v6.

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (682c3b6) 86.56% compared to head (228773e) 86.73%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #519      +/-   ##
==========================================
+ Coverage   86.56%   86.73%   +0.17%     
==========================================
  Files         387      388       +1     
  Lines        5776     5783       +7     
  Branches     1272     1267       -5     
==========================================
+ Hits         5000     5016      +16     
+ Misses        751      742       -9     
  Partials       25       25              

Files	Coverage Δ
src/CourseAuthoringRoutes.jsx	100.00% <100.00%> (ø)
src/course-rerun/index.jsx	100.00% <100.00%> (ø)
src/custom-pages/CustomPageCard.jsx	100.00% <100.00%> (ø)
src/editors/EditorContainer.jsx	100.00% <ø> (ø)
...create-or-rerun-course/CreateOrRerunCourseForm.jsx	88.70% <ø> (ø)
src/pages-and-resources/PagesAndResources.jsx	85.18% <100.00%> (+19.47%)	⬆️
...-and-resources/discussions/DiscussionsSettings.jsx	96.87% <100.00%> (+0.10%)	⬆️
...sources/discussions/app-list/AppListNextButton.jsx	100.00% <100.00%> (ø)
src/pages-and-resources/live/Settings.jsx	90.24% <100.00%> (+0.24%)	⬆️
...es/xpert-unit-summary/XpertUnitSummarySettings.jsx	100.00% <100.00%> (ø)
... and 9 more

... and 2 files with indirect coverage changes

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