Revert @beta annotation (manual) addition on interfaces

Author: rpanackal

orchestration/src/main/java/com/sap/ai/sdk/orchestration/model/ChatMessagesInner.java

@@ -14,13 +14,11 @@
 
 import com.fasterxml.jackson.annotation.JsonSubTypes;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
-import com.google.common.annotations.Beta;
 
 /** ChatMessagesInner */
 @JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION)
 @JsonSubTypes({
   @JsonSubTypes.Type(value = ChatMessage.class),
   @JsonSubTypes.Type(value = MultiChatMessage.class),
 })
-@Beta
 public interface ChatMessagesInner {}

orchestration/src/main/java/com/sap/ai/sdk/orchestration/model/MultiChatMessageContent.java

@@ -14,13 +14,11 @@
 
 import com.fasterxml.jackson.annotation.JsonSubTypes;
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
-import com.google.common.annotations.Beta;
 
 /** MultiChatMessageContent */
 @JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION)
 @JsonSubTypes({
   @JsonSubTypes.Type(value = ImageContent.class),
   @JsonSubTypes.Type(value = TextContent.class),
 })
-@Beta
 public interface MultiChatMessageContent {}