chore: import upstream snapshot with attribution

dotnet/test/VectorData/CosmosMongoDB.ConformanceTests/Support/CosmosMongoTestEnvironment.cs

@@ -0,0 +1,26 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Extensions.Configuration;
+
+namespace CosmosMongoDB.ConformanceTests.Support;
+
+#pragma warning disable CA1810 // Initialize all static fields when those fields are declared
+
+public static class CosmosMongoTestEnvironment
+{
+    public static readonly string? ConnectionString;
+
+    public static bool IsConnectionStringDefined => ConnectionString is not null;
+
+    static CosmosMongoTestEnvironment()
+    {
+        var configuration = new ConfigurationBuilder()
+            .AddJsonFile(path: "testsettings.json", optional: true)
+            .AddJsonFile(path: "testsettings.development.json", optional: true)
+            .AddEnvironmentVariables()
+            .AddUserSecrets<CosmosConnectionStringRequiredAttribute>()
+            .Build();
+
+        ConnectionString = configuration["CosmosMongo:ConnectionString"];
+    }
+}