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Use add at end perf only when sortWithCollection is false (#3471)

Because a collection can be modified without the full understanding on the collectionview, the optimistic adding that reduces perf is not ideal when `sortWithCollection: true`  This opens the door to all kinds of edge cases.  So we should only apply it when the collectionview itself is maintaining the sort.

However this brought up a related issue.  If a collection was `sortWithCollection: false` the _default_ `viewComparator` was still sorting with collection on add or update which mean that setting it to false only prevented a resort if `collection.sort()` was called directly, but not for any other circumstance.  If the collectionview is not maintaining the collection's sort, this prevents the sort from occurring at all.

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