Quarantine failing spec in sidebar_escalation_status_spec.js

What does this MR do and why?

Quarantines the failing spec below:

FAIL spec/frontend/sidebar/components/incidents/sidebar_escalation_status_spec.js
  ● SidebarEscalationStatus › sidebar › update Status event › updates the status
    expect(received).toBe(expected) // Object.is equality
    Expected: "ACKNOWLEDGED"
    Received: undefined
      169 |
      170 |       it('updates the status', async () => {
    > 171 |         expect(findStatusComponent().attributes('value')).toBe(STATUS_ACKNOWLEDGED);
          |                                                           ^
      172 |       });
      173 |     });
      174 |
      at Object.<anonymous> (spec/frontend/sidebar/components/incidents/sidebar_escalation_status_spec.js:171:59)

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