fix(middleware): use relative URL for sign-in page callbackUrl (#4534)

* Use relative URL for middleware's signin callbackUrl

* Include params to callbackUrl if any

* For testing purpose, append params to existing link for test instead of create another one

* Update apps/dev/components/header.js

Co-authored-by: CODY Mai <nhan.mai@shiftasia.com>
Co-authored-by: Thang Vu <31528554+ThangHuuVu@users.noreply.github.com>

packages/next-auth/src/next/middleware.ts

@@ -101,7 +101,7 @@ async function handleMiddleware(
 
   // the user is not logged in, redirect to the sign-in page
   const signInUrl = new URL(signInPage, req.nextUrl.origin)
-  signInUrl.searchParams.append("callbackUrl", req.url)
+  signInUrl.searchParams.append("callbackUrl", `${req.nextUrl.pathname}${req.nextUrl.search}`)
   return NextResponse.redirect(signInUrl)
 }