fix(Utils): fix monthly and yearly time step management in .GetFeatModel

Refs #106
4 jobs for 106-runmodel_cemaneige-fails-in-createinputsmodel-at-the-hourly-time-step in 8 minutes (queued for 1 minute and 32 seconds)
Status Name Job ID Coverage
  Build
passed build_patched #161988

00:00:27

 
  Regression
passed regression_patched #161989

00:01:01

 
  Tests
passed check_as_cran_patched #161991

00:02:02

passed check_not_cran_patched #161990

00:04:29