Fixes bug intorduced in https://github.com/sourcegraph/sourcegraph/pull/63231

Encode the URL search params added to returnTo search param value.

Previously the search param value hasn't been encoded resulting in URLs with broken search params , e.g. "/sign-in?returnTo=/cody/manage?teamID=1&inviteID=2" (note the second "?" making the search params invalid).

Test plan

• CI
• Tested manually:
  • Make signOutAndRedirectToSignIn available in the window object, e.g. window.signOutAndRedirectToSignIn = signOutAndRedirectToSignIn in the client/web/src/cody/management/api/react-query/callCodyProApi.ts
  • On "/cody/manage" page (any page works actually) ensure that a few search params are added to the URL
  • call signOutAndRedirectToSignIn in the browser console
  • ensure you have been sign out, signed back in and the search params are still in the URL

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