dev/core#5476 - Fix SearchKit totals to work with pseudoconstants

[colemanw]

Overview

Fixes bug described in https://lab.civicrm.org/dev/core/-/issues/5476

[civibot]

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[civibot]

The issue associated with the Pull Request can be viewed at https://lab.civicrm.org/dev/core/-/issues/5476

[totten]

This expands test-coverage and looks appropriate to the described issue. The patch is reported to fix an unreleased regression in 5.79, so it's good to get that in before 5.79 goes to RC.