Add 'Temporary:DriverMaxConnectionPoolSize' feature flag (#857)

Author: bigmontz

packages/testkit-backend/src/request-handlers.js

@@ -334,6 +334,7 @@ export function GetFeatures (_context, _params, wire) {
       'Feature:Bolt:4.4',
       'Feature:API:Result.List',
       'Temporary:ConnectionAcquisitionTimeout',
+      'Temporary:DriverMaxConnectionPoolSize',
       'Temporary:FastFailingDiscovery',
       'Temporary:ResultKeys',
       ...SUPPORTED_TLS

packages/testkit-backend/src/skipped-tests/common.js

@@ -20,6 +20,9 @@ const skippedTests = [
     ifEndsWith('test_should_fail_with_routing_failure_on_invalid_bookmark_discovery_failure'),
     ifEndsWith('test_should_fail_with_routing_failure_on_forbidden_discovery_failure')
   ),
+  skip('Flacky because sometimes the connection is actually available',
+    ifEndsWith('test_should_enforce_pool_size_per_cluster_member')
+  ),
   skip(
     'Not support by the JS driver',
     ifEquals('neo4j.sessionrun.TestSessionRun.test_partial_iteration')