test: resolve flaky repl test

[avivkeller]

Post 4f844f4 (#64034), there's a small chance that test/parallel/test-repl-user-error-handler.js will fail, since it treats our now asynchronous REPL as synchronous.

Based on the in-progress https://ci.nodejs.org/job/node-stress-single-test/800/, the flake rate is <1.5% (1 failure in 70 runs).

[avivkeller]

Actually, this looks like a bug in V8's replMode: true

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.14%. Comparing base (4f844f4) to head (1bf0e6f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #64594   +/-   ##
=======================================
  Coverage   90.13%   90.14%           
=======================================
  Files         741      741           
  Lines      241976   241976           
  Branches    45543    45551    +8     
=======================================
+ Hits       218116   218126   +10     
+ Misses      15379    15367   -12     
- Partials     8481     8483    +2     

see 36 files with indirect coverage changes

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