test: fix sequential/test-performance delay

This should resolve the flakiness on this test on slower systems where the inited time we store in JS can be much later than the nodeTiming one.

Fixes: https://github.com/nodejs/node/issues/23291

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines