test: enhance test-timers

In test-timers, confirm that all input values that should be coerced to
1 ms are not being coerced to a significantly larger value.

This eliminates the need for the separate test-regress-GH-897.

PR-URL: https://github.com/nodejs/node/pull/10960


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>