worker: simplify filename checks

Replace a couple of checks with a single regular expression.

PR-URL: https://github.com/nodejs/node/pull/27233


Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>