test: separate the test fixtures between ICU and URL
We need to separate the fixtures between ICU and WPT URL to update the WPT fixtures. Since ICU and URL isn't the same implementation and they also follow different specifications. We shouldn't use the URL's fixture for ICU's toASCII.
For now, I duplicated the fixture to a new file.
Refs: https://github.com/nodejs/node/pull/33770#issuecomment-680853608
cc: @watilde
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines