[Vertex AI] Remove unspecified enum cases from response types

Author: andrewheard

FirebaseVertexAI/Sources/GenerateContentResponse.swift

@@ -138,10 +138,9 @@ public struct Citation: Sendable {
 /// A value enumerating possible reasons for a model to terminate a content generation request.
 @available(iOS 15.0, macOS 11.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 public enum FinishReason: String, Sendable {
+  /// The finish reason is unknown.
   case unknown = "FINISH_REASON_UNKNOWN"
 
-  case unspecified = "FINISH_REASON_UNSPECIFIED"
-
   /// Natural stop point of the model or provided stop sequence.
   case stop = "STOP"
 
@@ -168,9 +167,6 @@ public struct PromptFeedback: Sendable {
     /// The block reason is unknown.
     case unknown = "UNKNOWN"
 
-    /// The block reason was not specified in the server response.
-    case unspecified = "BLOCK_REASON_UNSPECIFIED"
-
     /// The prompt was blocked because it was deemed unsafe.
     case safety = "SAFETY"
 

FirebaseVertexAI/Sources/Safety.swift

@@ -44,9 +44,6 @@ public struct SafetyRating: Equatable, Hashable, Sendable {
     /// Unknown. A new server value that isn't recognized by the SDK.
     case unknown = "UNKNOWN"
 
-    /// The probability was not specified in the server response.
-    case unspecified = "HARM_PROBABILITY_UNSPECIFIED"
-
     /// The probability is zero or close to zero. For benign content, the probability across all
     /// categories will be this value.
     case negligible = "NEGLIGIBLE"