[#3040] Refactor tests for the PeriodDisaggregation PGView
[#3040] Refactor tests for the PeriodDisaggregation PGView

(cherry picked from commit b63483358011086fb358a5ead42369f37970b3eb)

akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr,akvo/akvo-rsr