Add true "Detailed estimate" option to release retrospective report

There is a current option on the Release Retrospective Report to view "Work completed (points)" which displays records associated with the release and totals with the "best estimate", using the initial estimate unless a detailed estimate is available on the records.

Some teams only take the detailed estimate into account when reviewing the work in a release, as this is often a more concrete number that more accurately reflects the work. We should have an additional option here to view work completed solely based on the "Detailed estimate" field, without drawing from the initial estimate at all.