test: mark test-vm-timeout-escape-promise-2 flaky
parallel/test-vm-timeout-escape-promise-2 is consistently failing on Windows in our GitHub Actions workflow. Mark as flaky for now.
Refs: https://github.com/nodejs/node/issues/34163
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines