Remove pr: none clause from several CoreCLR pipelines (#42933)

eng/pipelines/coreclr/ci.yml

@@ -24,10 +24,8 @@ trigger:
     - eng/pipelines/libraries/*
     - eng/pipelines/runtime.yml
 
-
-pr: none
-
 jobs:
+
 #
 # Checkout repository
 #

eng/pipelines/coreclr/crossgen2-composite.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 6 * * *"
   displayName: Mon through Sun at 10:00 PM (UTC-8:00)

eng/pipelines/coreclr/crossgen2-gcstress.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 6 * * 0,1"
   displayName: Sat and Sun at 10:00 PM (UTC-8:00)

eng/pipelines/coreclr/crossgen2-outerloop.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 7 * * 0,2,4"
   displayName: Sun, Tue, Thu at 11:00 PM (UTC-8:00)

eng/pipelines/coreclr/crossgen2.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 6 * * *"
   displayName: Mon through Sun at 10:00 PM (UTC-8:00)

eng/pipelines/coreclr/ilasm.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 19 * * 6"
   displayName: Sat at 11:00 AM (UTC-8:00)

eng/pipelines/coreclr/jit-experimental.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 22 * * 0,6"
   displayName: Sun at 2:00 PM (UTC-8:00)

eng/pipelines/coreclr/r2r-extra.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 2 * * 0,1"
   displayName: Sat and Sun at 6:00 PM (UTC-8:00)

eng/pipelines/coreclr/r2r.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 5 * * *"
   displayName: Mon through Sun at 9:00 PM (UTC-8:00)

eng/pipelines/coreclr/runincontext.yml

 trigger: none
 
-pr: none
-
 schedules:
 - cron: "0 13 * * 6,0"
   displayName: Sat and Sun at 5:00 AM (UTC-8:00)