npm / cli / #2587

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fix(usage): better audit/boolean flag usage output

This adds the `audit` config item to the usage output of `npm ci`, and
also tweaks how usage flags are shown for boolean options that do not
default to false.  Their usage is shown as the `--no-x` form of the flag
to better communicate that the flag is needed to turn that normally true
option OFF.

The description of `audit` was also updated to include mention of `npm
ci` as one of the places where audits take place.

A small fix to make `install-ci-test` not try to redefine its own
usage, but to inherit from `ci` was also included.

3116 of 3205 branches covered (97.22%)

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15 of 15 new or added lines in 1 file covered. (100.0%)

5282 of 5425 relevant lines covered (97.36%)

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