build: run flaky tests in Travis
Continuation of https://github.com/nodejs/node/pull/27015
Skipping flaky tests in CI is an anti-pattern that should be avoided, as we do in our ownCI. Failing flaky tests don’t need to be blockers for a green CI result, but they should be run and reported somehow.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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