slapos.cookbook: remove deprecated softwaretype recipe

This has been superseeded by switch-softwaretype recipe.
5 jobs for feat/debian11 in 0 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:10:37

passed SlapOS.Eggs.UnitTest-Master.Python3

00:46:29

passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:51:58

passed SlapOS.Eggs.UnitTest-Master.Python2