test: add Unicode characters regression test
This test ensures that UTF-8 characters can be used in core JavaScript modules built into Node's binary.
Refs: https://github.com/nodejs/node/pull/11129
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test