backport: coverage — lax-no-cover post-unwind asserts on 3.11+lowest-direct

The 3.11 zero-cost-exception tracer dead-zone (python/cpython#106749) drops line
events for sync statements between a cancel-on-exit __aexit__ and the next real
await. On anyio 4.5.0 (lowest-direct) the unwind path differs from anyio 4.10
just enough that three additional post-async-with assertions fall in the
dead-zone on 3.11 only. Same family as the markers added in 361bb9d.

Author: maxisbey

tests/interaction/transports/test_flows.py

@@ -121,9 +121,9 @@ def echo(text: str) -> str:
             shttp_result = await shttp_client.call_tool("echo", {"text": "via http"})
             sse_result = await sse_client.call_tool("echo", {"text": "via sse"})
 
-    assert shttp_result == snapshot(
+    assert shttp_result == snapshot(  # pragma: lax no cover
         CallToolResult(content=[TextContent(type="text", text="via http")], structuredContent={"result": "via http"})
     )
-    assert sse_result == snapshot(
+    assert sse_result == snapshot(  # pragma: lax no cover
         CallToolResult(content=[TextContent(type="text", text="via sse")], structuredContent={"result": "via sse"})
     )

tests/interaction/transports/test_sse.py

@@ -60,7 +60,7 @@ def httpx_client_factory(
                 assert UUID(hex=captured_session_id[0]) in sse._read_stream_writers
                 assert await client.send_ping() == snapshot(EmptyResult())
 
-    assert UUID(hex=captured_session_id[0]) in sse._read_stream_writers
+    assert UUID(hex=captured_session_id[0]) in sse._read_stream_writers  # pragma: lax no cover
 
 
 @requirement("transport:sse:post:session-routing")