[rubygems/rubygems] Fix `$LOADED_FEATURES` cache sometimes not respected

In the cases where the initial manually `-I` path resolution succeeded,
we were passing a full path to the original require effectively skipping
the `$LOADED_FEATURES` cache. With this change, we _only_ do the
resolution when a matching requirable path is found in a default gem. In
that case, we skip activation of the default gem if we detect that the
required file will be picked up for a `-I` path.

https://github.com/rubygems/rubygems/commit/22ad5717c3

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