Include GROUP BY in _should_nest_selectable criteria

Include GROUP BY in _should_nest_selectable criteria

Fixed bug where usage of joined eager loading would not properly wrap the
query inside of a subquery when :meth:`.Query.group_by` were used against
the query.   When any kind of result-limiting approach is used, such as
DISTINCT, LIMIT, OFFSET, joined eager loading embeds the row-limited query
inside of a subquery so that the collection results are not impacted.   For
some reason, the presence of GROUP BY was never included in this criterion,
even though it has a similar effect as using DISTINCT.   Additionally, the
bug would prevent using GROUP BY at all for a joined eager load query for
most database platforms which forbid non-aggregated, non-grouped columns
from being in the query, as the additional columns for the joined eager
load would not be accepted by the database.

Fixes: #5065
Change-Id: I9a2ed8196f83297ec38012138d1a5acdf9e88155