chore: remove local test helper

[chenjiahan]

This PR removes the remaining local test helper in favor of direct imports from @rstackjs/test-utils. The tests now use proxyConsole and toPosixPath from the shared package, allowing the unused upath dependency to be removed.

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📥 Commits

Reviewing files that changed from the base of the PR and between ae1b06a and 15d45c4.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (5)

• package.json
• test/esnext/index.test.ts
• test/helper.ts
• test/rsbuild-basic/index.test.ts
• test/rspack-basic/index.test.ts

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