test(app-tools): isolate ts-node-loader fixture config

[9aoy]

Summary

This PR fixes a eco-CI-only failure in ts-node-loader.test.ts where ts-node could pick up a workspace-level tsconfig with unsupported moduleResolution values in eco-ci. The test now uses an isolated temporary tsconfig and runs the child process from the fixture root so resolution stays deterministic across environments.

Related Links

fix: https://github.com/rstackjs/rstack-ecosystem-ci/actions/runs/24324272940/job/71016372656

test ci: https://github.com/rstackjs/rstack-ecosystem-ci/actions/runs/24329567135

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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