feat: add dynamic variables and startup result handling in batch run schemas

- Introduced dynamic_variables field in BatchRunCreate schema to support flexible input types.
- Added BatchStartupResult schema to encapsulate startup state, including greeting and auto-confirmed messages.
- Updated BatchRunCaseOut schema to include startup results, enhancing the structure for test run outputs.
- Enhanced test run orchestration to prepare and validate dynamic configurations, ensuring isolated variable management across test cases.
- Implemented changes in the frontend to accommodate new data structures for improved test case execution and result tracking.

backend/services/test_runs/mock_tools.py

@@ -69,6 +69,9 @@ class MockToolExecutor(ToolExecutor):
 class TextClientToolPort:
     """Automatically acknowledge built-in message stages in text tests."""
 
+    def __init__(self) -> None:
+        self.auto_confirmed_messages: list[dict[str, Any]] = []
+
     async def call(
         self,
         function_name: str,
@@ -76,6 +79,7 @@ class TextClientToolPort:
         **_kwargs: Any,
     ) -> dict[str, Any]:
         if function_name == "show_message":
+            self.auto_confirmed_messages.append(dict(arguments))
             return {
                 "status": "ok",
                 "data": {"action": "confirmed", "arguments": arguments},