fix: reorder SeriesAggreg.data.frame by date (especially for regime time series)

Refs #133
2 jobs for 133-seriesaggreg-reorder-regime-time-series in 8 minutes and 6 seconds (queued for 7 seconds)
Status Name Job ID Coverage
  Check
passed check_as_cran_patched #186701

00:02:49

passed check_not_cran_patched #186700

00:05:16