fix tests

Author: KirillKurdyukov

src/Ydb.Sdk/test/Ydb.Sdk.Ado.Tests/Session/YdbImplicitStressTests.cs

@@ -26,7 +26,7 @@ public async Task Dispose_WaitsForAllLeases_AndSignalsOnEmptyExactlyOnce()
             var driver = DummyDriver();
             var source = new ImplicitSessionSource(driver, TestUtils.LoggerFactory);
 
-            var workers = Enumerable.Range(0, 1000).Select(async _ =>
+            var workers = Enumerable.Range(0, 200).Select(async _ =>
             {
                 await Task.Delay(Random.Shared.Next(0, 5));
                 try

src/Ydb.Sdk/test/Ydb.Sdk.Ado.Tests/YdbConnectionTests.cs

@@ -479,9 +479,9 @@ public async Task BulkUpsertImporter_ThrowsOnNonexistentTable()
     public async Task ClearPool_FireAndForget_DoesNotBlock_And_PoolsRecreate()
     {
         var csPooled = ConnectionString +
-                       "UseTls=false;DisableDiscovery=true;" +
-                       "CreateSessionTimeout=3;ConnectTimeout=3;" +
-                       "KeepAlivePingDelay=0;KeepAlivePingTimeout=0";
+                       ";UseTls=false;DisableDiscovery=true" +
+                       ";CreateSessionTimeout=3;ConnectTimeout=3" +
+                       ";KeepAlivePingDelay=0;KeepAlivePingTimeout=0";
         var csImplicit = csPooled + ";EnableImplicitSession=true";
 
         await using (var warmPooled = new YdbConnection(csPooled))