YDBOPS-8928: make connector tests MEDIUM, not LARGE (for OSS ya only) (#892)

* Hack ydb/library/yql/providers/generic/connector/tests to make them MEDIUM, not LARGE (for OSS ya only)

Author: vitalyisaev2

ydb/library/yql/providers/generic/connector/tests/ya.make

@@ -28,9 +28,9 @@ INCLUDE(${ARCADIA_ROOT}/library/recipes/docker_compose/recipe.inc)
 # Including of docker_compose/recipe.inc automatically converts these tests into LARGE, 
 # which makes it impossible to run them during precommit checks on Github CI. 
 # Next several lines forces these tests to be MEDIUM. To see discussion, visit YDBOPS-8928.
-SIZE(MEDIUM)
 
 IF (OPENSOURCE)
+    SIZE(MEDIUM)
     SET(TEST_TAGS_VALUE)
     SET(TEST_REQUIREMENTS_VALUE)
 ENDIF()