fix(app-tools): skip ts runtime setup when ts-node is absent

[GiveMe-A-Name]

Summary

Previously setupTsRuntime would throw an error when ts-node was not available. Now it gracefully skips runtime setup instead.

Changes

• src/utils/register.ts: Modified setupTsRuntime to return early when ts-node is absent
• tests/utils/register.test.ts: Updated and added tests for the new behavior

Testing

All existing tests pass with the new behavior.

Closes #8503

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