Perform health check before restore

[maximiliankolb]

users should not (try to) restore to a Foreman/Katello instance that is not running smoothly.

• [x] I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• [x] Foreman 3.11/Katello 4.13
• [x] Foreman 3.10/Katello 4.12
• [x] Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8)