test(v4): ensure proper error handling for invalid config

[colinaaa]

This PR adds test cases to verify that the build fails with a clear error message when the configuration file path is invalid.

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[gemini-code-assist]

Summary of Changes

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This pull request introduces new test cases to ensure robust error handling within the build process. Specifically, it validates that the system provides clear and informative error messages when a plugin is configured with an invalid or missing configuration file, thereby improving the developer experience by making debugging easier.

Highlights

• Error Handling Test: Added a new test case to verify that Rsbuild correctly fails with a clear error message when an invalid or non-existent configuration file path is provided to the pluginTailwindCSS.

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[gemini-code-assist]

Code Review

This pull request adds a test case to ensure the build fails correctly when an invalid TailwindCSS configuration path is provided. The implementation is sound. I've suggested a minor improvement to make the test failure message more descriptive if the build unexpectedly succeeds.