disable big parallelism

Author: KirillKurdyukov

.github/workflows/tests.yml

@@ -67,13 +67,7 @@ jobs:
         uses: actions/setup-dotnet@v4
         with:
           dotnet-version: ${{ matrix.dotnet-version }}
-      - name: Set up Docker Compose
-        uses: hoverkraft-tech/[email protected]
-        with:
-          compose-file: "./.github/ydb-slice-compose.yaml"
       - name: Run ADO.NET tests
-        env:
-          ConnectionString: "Host=localhost;Port=3135;Database=/Root/testdb"
         run: |
           docker cp ydb-local:/ydb_certs/ca.pem ~/
           cd src

.github/ydb-slice-compose.yaml

@@ -8,5 +8,5 @@ public class YdbFactoryFixture : IDbFactoryFixture
 {
     public DbProviderFactory Factory => YdbProviderFactory.Instance;
 
-    public string ConnectionString => "Host=localhost;Port=2136;Database=/local";
+    public string ConnectionString => "Host=localhost;Port=2136;Database=/local;MaxSessionPool=10";
 }

.github/ydb.yaml

@@ -35,7 +35,7 @@ public async Task Authentication_WhenUserAndPassword_ReturnValidConnection()
         ydbCommand.CommandText = $"DROP USER {kurdyukovkirya};";
         await ydbCommand.ExecuteNonQueryAsync();
     }
-    
+
     [Fact]
     public async Task ExecuteNonQueryAsync_WhenCreateUser_ReturnEmptyResultSet()
     {

src/Ydb.Sdk/tests/Ado/Specification/YdbFactoryFixture.cs

@@ -8,6 +8,8 @@
 
 namespace Ydb.Sdk.Tests.Ado;
 
+[Collection("YdbCommandTests")]
+[CollectionDefinition("YdbCommandTests isolation test")]
 public class YdbCommandTests : YdbAdoNetFixture
 {
     public YdbCommandTests(YdbFactoryFixture fixture) : base(fixture)