Split `test-whatwg-encoding-textdecoder-fatal.js` into
- `test-whatwg-encoding-custom-textdecoder-fatal.js` which
is a customized version of the WPT that tests for Node.js-specific
error codes.
- `test-whatwg-encoding-custom-textdecoder-invalid-arg` which
tests `ERR_INVALID_ARG_TYPE`
PR-URL: https://github.com/nodejs/node/pull/25155
Reviewed-By: James M Snell <jasnell@gmail.com>