Fix Runner access for programming groups

* We also rename the corresponding columns in the Runner model, so that for polymorphic association gets clear.

db/migrate/20230820182149_rename_user_to_contributor_in_runners.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class RenameUserToContributorInRunners < ActiveRecord::Migration[7.0]
+  def change
+    change_table :runners do |t|
+      t.rename :user_id, :contributor_id
+      t.rename :user_type, :contributor_type
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2023_08_19_084917) do
+ActiveRecord::Schema[7.0].define(version: 2023_08_20_182149) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
   enable_extension "pgcrypto"
@@ -416,12 +416,12 @@ ActiveRecord::Schema[7.0].define(version: 2023_08_19_084917) do
   create_table "runners", force: :cascade do |t|
     t.string "runner_id"
     t.bigint "execution_environment_id"
-    t.string "user_type"
-    t.bigint "user_id"
+    t.string "contributor_type"
+    t.bigint "contributor_id"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.index ["contributor_type", "contributor_id"], name: "index_runners_on_user"
     t.index ["execution_environment_id"], name: "index_runners_on_execution_environment_id"
-    t.index ["user_type", "user_id"], name: "index_runners_on_user"
   end
 
   create_table "searches", id: :serial, force: :cascade do |t|