tests: fix post and pool version tests helpers.

* Fix the pool version SQS service to always be mocked before every
  test. Before we had to manually set it up before every test dealing
  with pool versions.

* Fix it so that we reconnect to the post/pool version databases before
  every test. Before using $ARCHIVE_DATABASE_URL to set the database url
  failed because environment variables weren't loaded by dotenv yet when
  connections were first established.

test/functional/pool_versions_controller_test.rb

@@ -3,30 +3,17 @@ require 'test_helper'
 class PoolVersionsControllerTest < ActionDispatch::IntegrationTest
   context "The pool versions controller" do
     setup do
-      mock_pool_archive_service!
-      start_pool_archive_transaction
       @user = create(:user)
     end
 
-    teardown do
-      rollback_pool_archive_transaction
-    end
-
     context "index action" do
       setup do
-        as_user do
-          @pool = create(:pool)
-        end
+        @pool = as(@user) { create(:pool) }
         @user_2 = create(:user)
         @user_3 = create(:user)
 
-        CurrentUser.scoped(@user_2, "1.2.3.4") do
-          @pool.update(:post_ids => "1 2")
-        end
-
-        CurrentUser.scoped(@user_3, "5.6.7.8") do
-          @pool.update(:post_ids => "1 2 3 4")
-        end
+        as(@user_2) { @pool.update(post_ids: "1 2") }
+        as(@user_3) { @pool.update(post_ids: "1 2 3 4") }
 
         @versions = @pool.versions
       end