Clean unnecessary 'attachToDocument' in 'spec/frontend/environments'

Summary

As described in &2419 (closed), we need to clean up our Jest tests from unnecessary attachToDocument usage

Risks

No risks

Involved specs

• spec/frontend/environments/environment_monitoring_spec.js
• spec/frontend/environments/environment_rollback_spec.js
• spec/frontend/environments/environment_stop_spec.js
• spec/frontend/environments/environment_terminal_button_spec.js