Implement ability for caller to update red team user agent

Co-authored-by: slister1001 <[email protected]>

Author: Copilot

sdk/evaluation/azure-ai-evaluation/azure/ai/evaluation/_user_agent.py

@@ -38,11 +38,35 @@ def add_useragent_product(cls, *product: str) -> Iterator[None]:
 
     @classmethod
     @contextmanager
-    def redteam_context(cls) -> Iterator[None]:
+    def redteam_context(cls, *, subtype: str = "RedTeam", **kwargs) -> Iterator[None]:
         """Context manager to use red team user agent for RAI service calls
 
         This context manager temporarily sets the user agent to include red team context
         for all calls within the context.
+
+        :param subtype: The subtype to use in the red team user agent. Defaults to "RedTeam"
+        :type subtype: str
+        :param kwargs: Additional keyword arguments for future extensibility
+        """
+        with cls.add_useragent_product(f"(type=redteam; subtype={subtype})"):
+            yield
+
+    @classmethod
+    @contextmanager
+    def redteam_context_with_product(cls, *products: str) -> Iterator[None]:
+        """Context manager to use custom red team user agent for RAI service calls
+
+        This context manager temporarily sets the user agent to include custom red team
+        products for all calls within the context.
+
+        :param products: User Agent products to append for red team context
+        :type products: str
+
+        ..see-also::
+
+            `User-Agent section of RFC 9110, <https://www.rfc-editor.org/rfc/rfc9110#name-user-agent>`
         """
-        with cls.add_useragent_product("(type=redteam; subtype=RedTeam)"):
+        default_redteam_product = "(type=redteam; subtype=RedTeam)"
+        all_products = [default_redteam_product] + list(products)
+        with cls.add_useragent_product(*all_products):
             yield