Use throwing overloads in SetupTestDirectory

[beena352]

Summary of the Pull Request

Use throwing std::filesystem overloads. Addresses code review feedback.

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[Copilot]

Pull request overview

This PR simplifies the WSLC e2e test helper SetupTestDirectory() by switching from std::filesystem error-code overloads plus manual THROW_HR_IF_MSG checks to the throwing overloads, reducing boilerplate in the test utilities.

Changes:

• Replace remove_all(..., std::error_code&) + manual HRESULT checks with remove_all(...) throwing overload.
• Replace create_directories(..., std::error_code&) + manual HRESULT checks with create_directories(...) throwing overload.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.