Remove PairProgrammingExerciseFeedback

* Remove view, controller, routes & policy for PairProgrammingExerciseFeedback
* Keep model & database table

app/models/pair_programming_exercise_feedback.rb

@@ -12,6 +12,32 @@ class PairProgrammingExerciseFeedback < ApplicationRecord
   scope :intermediate, -> { where.not(normalized_score: 1.00) }
   scope :final, -> { where(normalized_score: 1.00) }
 
+  enum difficulty: {
+    too_easy: 0,
+    bit_too_easy: 1,
+    just_right: 2,
+    bit_too_difficult: 3,
+    too_difficult: 4,
+  }, _prefix: true
+
+  enum user_estimated_worktime: {
+    less_5min: 0,
+    between_5_and_10min: 1,
+    between_10_and_20min: 2,
+    between_20_and_30min: 3,
+    more_30min: 4,
+  }, _prefix: true
+
+  enum reason_work_alone: {
+    found_no_partner: 0,
+    too_difficult_to_find_partner: 1,
+    faster_alone: 2,
+    not_working_with_strangers: 3,
+    prefer_to_work_alone: 4,
+    accidentally_alone: 5,
+    other: 6,
+  }, _prefix: true
+
   def to_s
     'Pair Programming Exercise Feedback'
   end