Add unit tests for AwsBlobProviderConfiguration and DefaultAmazonS3ClientFactory

- Created `AwsBlobProviderConfiguration_Tests` to validate ServiceURL setting and retrieval.
- Implemented `DefaultAmazonS3ClientFactory_Tests` to ensure S3 client creation with and without custom ServiceURL.
- Tests cover scenarios for both S3-compatible services and default AWS S3 behavior.

framework/test/Volo.Abp.BlobStoring.Aws.Tests/Volo/Abp/BlobStoring/Aws/AwsBlobProviderConfiguration_Tests.cs

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+using Shouldly;
+using Xunit;
+
+namespace Volo.Abp.BlobStoring.Aws;
+
+public class AwsBlobProviderConfiguration_Tests : AbpBlobStoringAwsTestCommonBase
+{
+    [Fact]
+    public void Should_Set_And_Get_ServiceURL()
+    {
+        // Arrange
+        var containerConfiguration = new BlobContainerConfiguration();
+        var awsConfiguration = new AwsBlobProviderConfiguration(containerConfiguration);
+        const string serviceUrl = "https://minio.example.com:9000";
+
+        // Act
+        awsConfiguration.ServiceURL = serviceUrl;
+
+        // Assert
+        awsConfiguration.ServiceURL.ShouldBe(serviceUrl);
+    }
+
+    [Fact]
+    public void Should_Return_Null_When_ServiceURL_Not_Set()
+    {
+        // Arrange
+        var containerConfiguration = new BlobContainerConfiguration();
+        var awsConfiguration = new AwsBlobProviderConfiguration(containerConfiguration);
+
+        // Act & Assert
+        awsConfiguration.ServiceURL.ShouldBeNull();
+    }
+
+    [Fact]
+    public void Should_Configure_ServiceURL_Using_UseAws_Extension()
+    {
+        // Arrange
+        var containerConfiguration = new BlobContainerConfiguration();
+        const string serviceUrl = "https://spaces.digitalocean.com";
+
+        // Act
+        containerConfiguration.UseAws(config =>
+        {
+            config.ServiceURL = serviceUrl;
+            config.Region = "us-east-1";
+        });
+
+        // Assert
+        var awsConfig = containerConfiguration.GetAwsConfiguration();
+        awsConfig.ServiceURL.ShouldBe(serviceUrl);
+    }
+} 

framework/test/Volo.Abp.BlobStoring.Aws.Tests/Volo/Abp/BlobStoring/Aws/DefaultAmazonS3ClientFactory_Tests.cs

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+using System.Threading.Tasks;
+using Amazon.S3;
+using Microsoft.Extensions.DependencyInjection;
+using Shouldly;
+using Xunit;
+
+namespace Volo.Abp.BlobStoring.Aws;
+
+public class DefaultAmazonS3ClientFactory_Tests : AbpBlobStoringAwsTestBase
+{
+    private readonly IAmazonS3ClientFactory _amazonS3ClientFactory;
+
+    public DefaultAmazonS3ClientFactory_Tests()
+    {
+        _amazonS3ClientFactory = GetRequiredService<IAmazonS3ClientFactory>();
+    }
+
+    [Fact]
+    public async Task Should_Create_S3Client_With_Custom_ServiceURL()
+    {
+        // Arrange
+        var containerConfiguration = new BlobContainerConfiguration();
+        const string serviceUrl = "https://minio.example.com:9000";
+        
+        var awsConfiguration = new AwsBlobProviderConfiguration(containerConfiguration)
+        {
+            AccessKeyId = "test-access-key",
+            SecretAccessKey = "test-secret-key",
+            Region = "us-east-1",
+            ServiceURL = serviceUrl
+        };
+
+        // Act
+        using var s3Client = await _amazonS3ClientFactory.GetAmazonS3Client(awsConfiguration);
+
+        // Assert
+        s3Client.ShouldNotBeNull();
+        s3Client.Config.ServiceURL.ShouldBe(serviceUrl + "/"); // AWS SDK automatically appends trailing slash
+        ((AmazonS3Config)s3Client.Config).ForcePathStyle.ShouldBeTrue(); // Should be enabled for S3-compatible services
+    }
+
+    [Fact]
+    public async Task Should_Create_S3Client_Without_Custom_ServiceURL()
+    {
+        // Arrange
+        var containerConfiguration = new BlobContainerConfiguration();
+        
+        var awsConfiguration = new AwsBlobProviderConfiguration(containerConfiguration)
+        {
+            AccessKeyId = "test-access-key",
+            SecretAccessKey = "test-secret-key",
+            Region = "us-east-1"
+            // ServiceURL not set
+        };
+
+        // Act
+        using var s3Client = await _amazonS3ClientFactory.GetAmazonS3Client(awsConfiguration);
+
+        // Assert
+        s3Client.ShouldNotBeNull();
+        s3Client.Config.ServiceURL.ShouldBeNull(); // Should use default AWS S3 service
+        ((AmazonS3Config)s3Client.Config).ForcePathStyle.ShouldBeFalse(); // Should be false for AWS S3
+    }
+}