Add workaround for available(watchOS, unavailable) being ignored

Author: andrewheard

FirebaseAI/Sources/Types/Internal/Live/BidiGenerateContentServerMessage.swift

@@ -15,7 +15,7 @@
 import Foundation
 
 /// Response message for BidiGenerateContent RPC call.
-@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 @available(watchOS, unavailable)
 struct BidiGenerateContentServerMessage: Sendable {
   /// The type of the message.
@@ -48,7 +48,7 @@ struct BidiGenerateContentServerMessage: Sendable {
 
 // MARK: - Decodable
 
-@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 @available(watchOS, unavailable)
 extension BidiGenerateContentServerMessage: Decodable {
   enum CodingKeys: String, CodingKey {

FirebaseAI/Sources/Types/Internal/Live/LiveSessionService.swift

@@ -28,7 +28,7 @@ import Foundation
 ///
 /// This mainly comes into play when we don't want to block developers from sending messages while a
 /// session is being reloaded.
-@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 @available(watchOS, unavailable)
 actor LiveSessionService {
   let responses: AsyncThrowingStream<LiveServerMessage, Error>

FirebaseAI/Sources/Types/Public/Live/LiveServerToolCall.swift

@@ -16,7 +16,7 @@
 ///
 /// The client should return matching ``FunctionResponsePart``, where the `functionId` fields
 /// correspond to individual ``FunctionCallPart``s.
-@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 @available(watchOS, unavailable)
 public struct LiveServerToolCall: Sendable {
   let serverToolCall: BidiGenerateContentToolCall

FirebaseAI/Sources/Types/Public/Live/LiveSession.swift

@@ -21,7 +21,7 @@ import Foundation
 /// through the incremental API (such as ``sendContent(_:turnComplete:)``).
 ///
 /// To create an instance of this class, see ``LiveGenerativeModel``.
-@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 @available(watchOS, unavailable)
 public final class LiveSession: Sendable {
   private let service: LiveSessionService