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fix: improve heuristics when dist-tags.latest is in range

Previously, there were two problems.

First problem, even though we heuristically choose the version that best
suits the stated 'engines' restriction, we were skipping that check when
the 'defaultTag' (ie, 'latest', typically) version was a semver match.

Second problem, the heuristic was improperly being set for 'staged' and
'restricted' packages, resulting in failure to sort those versions
properly.

Only choose the defaultTag version if it both a semver match, _and_
passes the engines/staged/restricted heuristics, and apply those
heuristics properly in the sort that comes later, if the defaultTag
version is not used.

Related-to: https://github.com/npm/rfcs/pull/405

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