Support reset password flow for CCloud connections

[flippingbits]

We delegate the authentication with CCloud to the CCloud UI. Upon completion of the authentication flow, the CCloud UI redirects the user to the sidecar-exposed callback page available at http://localhost:26636/gateway/v1/callback-vscode-docs.

If the user decides to reset their password during the authentication flow, the CCloud UI will redirect the user to the URLhttp://localhost:26636/?email=...&success=true&message=... after completing the reset password flow.

At the moment, we render the error Resource not found in this case because we don't handle the / route. We should handle the redirect URI used by the reset password flow and redirect the user to the VS Code extension so that the extension can prompt the user to restart the authentication flow and sign into CCloud using their new password.

cc @shouples @noeldevelops this will require some work on the extension side and might require further discussion