test: remove flaky status for test-npm-install
I haven't seen test-npm-install fail on arm in a long time. There is no open issue for it being unreliable. Remove flaky designation in parallel.status file. (If it turns out it is flaky, it's easy enough to open an issue and restore the flaky designation.)
Ref: https://github.com/nodejs/node/issues/13498
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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