feat: [recaptchaenterprise] A new enum Challenge is added (#5807)

* feat: A new enum `Challenge` is added
feat: A new field `challenge` is added to message `.google.cloud.recaptchaenterprise.v1.RiskAnalysis`

PiperOrigin-RevId: 695828238

Source-Link: googleapis/googleapis@2aabebc

Source-Link: googleapis/googleapis-gen@9ebf4d5
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packages/google-cloud-recaptchaenterprise/protos/google/cloud/recaptchaenterprise/v1/recaptchaenterprise.proto

@@ -996,6 +996,22 @@ message RiskAnalysis {
     SUSPECTED_CHARGEBACK = 7;
   }
 
+  // Challenge information for SCORE_AND_CHALLENGE keys
+  enum Challenge {
+    // Default unspecified type.
+    CHALLENGE_UNSPECIFIED = 0;
+
+    // No challenge was presented for solving.
+    NOCAPTCHA = 1;
+
+    // A solution was submitted that was correct.
+    PASSED = 2;
+
+    // A solution was submitted that was incorrect or otherwise
+    // deemed suspicious.
+    FAILED = 3;
+  }
+
   // Output only. Legitimate event score from 0.0 to 1.0.
   // (1.0 means very likely legitimate traffic while 0.0 means very likely
   // non-legitimate traffic).
@@ -1009,6 +1025,9 @@ message RiskAnalysis {
   // The set of possible reasons is subject to change.
   repeated string extended_verdict_reasons = 3
       [(google.api.field_behavior) = OUTPUT_ONLY];
+
+  // Output only. Challenge information for SCORE_AND_CHALLENGE keys
+  Challenge challenge = 4 [(google.api.field_behavior) = OUTPUT_ONLY];
 }
 
 // Properties of the provided event token.