Improve name of CI entry validation context hook

lib/gitlab/ci/config/node/entry.rb

@@ -34,7 +34,7 @@ module Gitlab
           end
           def validate!
-            @validator.validate(:after)
+            @validator.validate(:processed)
             @entries.each_value(&:validate!)
           end

lib/gitlab/ci/config/node/jobs.rb

@@ -10,7 +10,7 @@ module Gitlab
           validations do
             validates :config, type: Hash
-            validate :jobs_presence, on: :after
+            validate :jobs_presence, on: :processed
             def jobs_presence
               unless relevant?

lib/gitlab/ci/config/node/stage.rb

@@ -11,7 +11,7 @@ module Gitlab
           validations do
             validates :config, key: true
             validates :global, required_attribute: true
-            validate :known_stage, on: :after
+            validate :known_stage, on: :processed
             def known_stage
               unless known?