Moved integration test modules into the "integration-tests" profile

xwiki-platform-test-upgrade depends on xwiki-platform-extension-test-pageobjects which is only built when integration-tests profile is activated. Currently xwiki-platform-test-upgrade is built without activating any profile: so the build is breaking if the integration-test is not activated and some changes have been made in xwiki-platform-extension-test-pageobjects.