Azure AD B2Cサンプルをxunit v3に移行する

[tsuna-can-se]

この Pull request で実施したこと

Azure AD B2CサンプルをxUnit v3に移行しました。
コードカバレッジの取得ツールを coverlet.collector から Microsoft.Testing.Extensions.CodeCoverage に変更しました。
カバレッジ取得ツールの変更にあわせてワークフローを修正しました。

この Pull request では実施していないこと

なし

Issues や Discussions 、関連する Web サイトなどへのリンク

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[Copilot]

Pull Request Overview

This pull request migrates the Azure AD B2C sample to xUnit v3 and switches the code coverage tool from coverlet.collector to Microsoft.Testing.Extensions.CodeCoverage while updating the related CI workflow.

• Updated the GitHub workflow to use new test and coverage commands.
• Modified API tests to incorporate cancellation tokens and update endpoint references.
• Removed an unused using statement and cleaned up formatting in the test factory.

Reviewed Changes

Copilot reviewed 3 out of 7 changed files in this pull request and generated no comments.

File	Description
.github/workflows/samples-azure-ad-b2c-auth-ci.yml	Updated test execution and coverage reporting steps in the CI workflow to support the new tools and configurations.
samples/AzureADB2CAuth/auth-backend/tests/Dressca.IntegrationTest/ApiTest.cs	Revised API tests to add cancellation tokens to HTTP requests and update endpoint references.
samples/AzureADB2CAuth/auth-backend/tests/Dressca.IntegrationTest/ApiTestWebApplicationFactory.cs	Removed an extraneous blank line to clean up the file.

Files not reviewed (4)

• samples/AzureADB2CAuth/auth-backend/Directory.Packages.props: Language not supported
• samples/AzureADB2CAuth/auth-backend/Dressca.sln: Language not supported
• samples/AzureADB2CAuth/auth-backend/tests/Directory.Build.props: Language not supported
• samples/AzureADB2CAuth/auth-backend/tests/Dressca.IntegrationTest/Dressca.IntegrationTest.csproj: Language not supported

Comments suppressed due to low confidence (1)

samples/AzureADB2CAuth/auth-backend/tests/Dressca.IntegrationTest/ApiTest.cs:53

• The API endpoint was updated from 'api/servertime' to 'api/serverTime'; please confirm that this change matches the intended backend routing.

var response = await client.GetAsync("api/serverTime", cancellationToken);