Fix pylint too-many-public-methods in log exporter tests

Add pylint disable comment, matching the pattern used in
test_otlp_metrics_exporter.py.

Author: Krishnachaitanyakc

exporter/opentelemetry-exporter-otlp-proto-http/tests/test_proto_log_exporter.py

@@ -77,7 +77,7 @@
 ENV_TIMEOUT = "30"
 
 
-class TestOTLPHTTPLogExporter(unittest.TestCase):
+class TestOTLPHTTPLogExporter(unittest.TestCase):  # pylint: disable=too-many-public-methods
     def test_constructor_default(self):
         exporter = OTLPLogExporter()