Make sure to close the projection query runner after remote projection is done

* also deletes unused code

(cherry picked from commit 402e658)

Author: DarthMax

graphdatascience/query_runner/neo4j_query_runner.py

@@ -145,8 +145,6 @@ def run_cypher(
             connectivity_retry_config = Neo4jQueryRunner.ConnectivityRetriesConfig()
         self._verify_connectivity(database=database, retry_config=connectivity_retry_config)
 
-        self._driver.session()
-
         with self._driver.session(database=database, bookmarks=self.bookmarks()) as session:
             try:
                 result = session.run(query, params)

graphdatascience/query_runner/protocol/project_protocols.py

@@ -150,4 +150,8 @@ def project_fn() -> DataFrame:
                 ProtocolVersion.V3.versioned_procedure_name(endpoint), params, yields, database, logging, False
             )
 
-        return project_fn()
+        projection_result = project_fn()
+
+        projection_query_runner.close()
+
+        return projection_result