src: elevate namespaces in node_worker.cc

In node_worker.cc there are few instances where v8
namespaced entitites are used inline. Elevate them
with `using` semantics.

PR-URL: https://github.com/nodejs/node/pull/27568


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>