Completely remove old hints connected to the execution environment

spec/models/hint_spec.rb

@@ -1,37 +0,0 @@
-require 'rails_helper'
-
-describe Hint do
-  let(:hint) { described_class.create }
-
-  it 'validates the presence of an execution environment' do
-    expect(hint.errors[:execution_environment_id]).to be_present
-  end
-
-  it 'validates the presence of a locale' do
-    expect(hint.errors[:locale]).to be_present
-  end
-
-  it 'validates the presence of a message' do
-    expect(hint.errors[:message]).to be_present
-  end
-
-  it 'validates the presence of a name' do
-    expect(hint.errors[:name]).to be_present
-  end
-
-  it 'validates the presence of a regular expression' do
-    expect(hint.errors[:regular_expression]).to be_present
-  end
-
-  describe '.nested_resource?' do
-    it 'is true' do
-      expect(described_class.nested_resource?).to be true
-    end
-  end
-
-  describe '#to_s' do
-    it "equals the hint's name" do
-      expect(hint.to_s).to eq(hint.name)
-    end
-  end
-end