Update middleware to account for redirect after MSCA login

[krischarbonneau]

ADO-192855

Fixed AB#192855

Changelog

fix: Update middleware to handle MSCA redirect

Description of proposed changes:

This PR updates our middleware to handle the redirect from MSCA after logging in. Since the recent changes to the ARB in dev, Stream 3 has been redirecting to /&Lang=eng or /&Lang=fra depending on the language selected before redirecting. This PR adds a couple rules at the top of the stack in our middleware that checks for this and redirects to the respective dashboard page.

What to test for/How to test

1. Pull in branch
2. Type npm run dev
3. Try navigating to /&Lang=eng (casing is important here as the parameter passed to us is uppercase Lang). You should be redirected to the English dashboard
4. Try navigating to /&Lang=fra. You should be redirected to the French dashboard

Additional Notes

In the future we should look into leveraging the NEXT_LOCALE cookie to handle locale redirection. More info can be found here: https://nextjs.org/docs/pages/building-your-application/routing/internationalization#leveraging-the-next_locale-cookie

[github-actions]

Integration Deployment 🚀 - Build Status

Jest Coverage Report
Cypress Coverage Report