List required repos for Capsule leapp upgrade

[Lennonka]

What changes are you introducing?

Listing required repos for Capsule leapp upgrade

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

Because they were missing and users would be running into problems not knowing that they need them.

https://issues.redhat.com/browse/SAT-27981

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

Not sure about the formatting.

Checklists

• [x] I am okay with my commits getting squashed when you merge this PR.
• [x] I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• [x] Foreman 3.12/Katello 4.14 (Satellite 6.16)
• [ ] Foreman 3.11/Katello 4.13
• [ ] Foreman 3.10/Katello 4.12
• [ ] Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• [ ] Foreman 3.8/Katello 4.10
• [ ] Foreman 3.7/Katello 4.9 (Satellite 6.14)
• [ ] Foreman 3.6/Katello 4.8
• [ ] Foreman 3.5/Katello 4.7 (Satellite 6.13; orcharhino 6.6/6.7)
• We do not accept PRs for Foreman older than 3.5.