fix: remove unnecessary 'pragma: no cover' from streamable_http test helpers

These helpers are executed in subprocesses but coverage is configured to track multiprocessing, causing strict-no-cover to fail.

Author: Ashutosh0x

tests/shared/test_streamable_http.py

@@ -1385,7 +1385,7 @@ async def sampling_callback(
 
 
 # Context-aware server implementation for testing request context propagation
-class ContextAwareServerTest(Server):  # pragma: no cover
+class ContextAwareServerTest(Server):
     def __init__(self):
         super().__init__("ContextAwareServer")
 
@@ -1445,7 +1445,7 @@ async def handle_call_tool(name: str, args: dict[str, Any]) -> list[TextContent]
 
 
 # Server runner for context-aware testing
-def run_context_aware_server(port: int):  # pragma: no cover
+def run_context_aware_server(port: int):
     """Run the context-aware test server."""
     server = ContextAwareServerTest()