Add GraphQL error for test/dev

Update some tests to match loosely instead of exactly

app/controllers/graphql_controller.rb

@@ -37,7 +37,11 @@ class GraphqlController < ApplicationController
   rescue_from StandardError do |exception|
     log_exception(exception)
 
-    render_error("Internal server error")
+    if Rails.env.test? || Rails.env.development?
+      render_error("Internal server error: #{exception.message}")
+    else
+      render_error("Internal server error")
+    end
   end
 
   rescue_from Gitlab::Graphql::Variables::Invalid do |exception|

ee/spec/requests/api/graphql/mutations/dast_site_profiles/create_spec.rb

@@ -32,7 +32,9 @@ RSpec.describe 'Creating a DAST Site Profile' do
         allow(DastSiteProfile).to receive(:create!).and_raise(StandardError)
       end
 
-      it_behaves_like 'a mutation that returns top-level errors', errors: ['Internal server error']
+      it_behaves_like 'a mutation that returns top-level errors' do
+        let(:match_errors) { contain_exactly(include('Internal server error')) }
+      end
     end
   end
 end

ee/spec/requests/api/graphql/mutations/dast_site_profiles/delete_spec.rb

@@ -38,7 +38,9 @@ RSpec.describe 'Creating a DAST Site Profile' do
         dast_site_profile.destroy!
       end
 
-      it_behaves_like 'a mutation that returns top-level errors', errors: ['Internal server error']
+      it_behaves_like 'a mutation that returns top-level errors' do
+        let(:match_errors) { contain_exactly(include("Internal server error: Couldn't find DastSiteProfile")) }
+      end
     end
 
     context 'when wrong type of global id is passed' do