Add tests for singlefile bundles with non-ascii characters

[jtschuster]

Adds tests for bundles that contain non-ascii characters to validate all strings in a singlefile bundle are written as UTF-8.

Fixes #118098

[Copilot]

Pull Request Overview

This PR adds comprehensive test coverage for singlefile bundles containing non-ASCII characters to ensure proper UTF-8 encoding throughout the bundling process. The change addresses issue #118098 by validating that the bundler correctly handles Unicode strings in file paths and bundle metadata.

• Creates a new test project HelloWorld_中文 with Chinese characters to verify Unicode support
• Adds unit tests to validate bundling operations with non-ASCII file paths and names
• Extends integration tests to verify end-to-end functionality of bundles with special characters

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

File	Description
BundlerConsistencyTests.cs	Adds unit test for bundling files with non-ASCII characters in relative paths
AppLaunch.cs	Adds integration test for launching self-contained apps with non-ASCII names
HelloWorld_中文/*.cs	New test project files with Unicode characters in project name
HelloWorld_中文/*.csproj	Project configuration files for the Unicode test project

Comments suppressed due to low confidence (1)

src/installer/tests/Microsoft.NET.HostModel.Tests/Bundle/BundlerConsistencyTests.cs:135

• The test creates a bundle but doesn't verify that the bundle was created successfully or validate any properties of the generated bundle. Consider adding assertions to verify the bundle generation succeeded and that the non-ASCII characters are preserved correctly.

            var bundlePath = bundler.GenerateBundle(fileSpecs);

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