Improve CAPTCHA handling in signup methods

This commit refines the usage of CAPTCHA in signup methods by storing the CAPTCHA token and instance, providing a reset function, and managing validation on server-side. A new context instance has been introduced to keep track of the CAPTCHA instance besides the token. Proper error reporting is now in place for CAPTCHA verification failure.

packages/features/auth/src/components/sign-up-methods-container.tsx

@@ -28,7 +28,7 @@ export function SignUpMethodsContainer(props: {
   inviteToken?: string;
 }) {
   const redirectUrl = getCallbackUrl(props);
-  const captchaToken = useCaptchaToken();
+  const { captchaToken } = useCaptchaToken();
 
   return (
     <>