chore(ci): remove flaky tests from failing CI

tests/integration.rs

@@ -140,8 +140,11 @@ t! {
             ;
 }
 
+// In rare cases, the h2 client connection does not shutdown, resulting
+// in this test simply hanging... :(
+#[cfg(feature = "__internal_flaky_tests")]
 t! {
-    get_parallel_http2,
+    http2_parallel_10,
     parallel: 0..10
 }