Add option to suppress feedback messages

This is used to dynamically exclude some test results from being shown to users, but still allows them to run in the background (e.g., for research).

db/migrate/20230727080619_add_hidden_feedback_to_files.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddHiddenFeedbackToFiles < ActiveRecord::Migration[7.0]
+  def change
+    add_column :files, :hidden_feedback, :boolean, default: false, null: false
+  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_03_20_220012) do
+ActiveRecord::Schema[7.0].define(version: 2023_07_27_080619) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
   enable_extension "pgcrypto"
@@ -284,6 +284,7 @@ ActiveRecord::Schema[7.0].define(version: 2023_03_20_220012) do
     t.float "weight"
     t.string "path"
     t.integer "file_template_id"
+    t.boolean "hidden_feedback", default: false, null: false
     t.index ["context_id", "context_type"], name: "index_files_on_context_id_and_context_type"
   end