Add missing step to update RHSM cert

[Lennonka]

What changes are you introducing?

Adding missing step to update the CA cert in RHSM config

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

https://issues.redhat.com/browse/SAT-28431

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

Follow-up on https://github.com/theforeman/foreman-documentation/pull/3193

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.

[github-actions[bot]]

The PR preview for 2802ce419cdf3413213823c1b406d9a85bf32a3e is available at theforeman-foreman-documentation-preview-pr-3342.surge.sh

The following output files are affected by this PR:

• Managing_Hosts/index-katello.html
• Managing_Hosts/index-orcharhino.html
• Managing_Hosts/index-satellite.html

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[Lennonka]

I've set the tech review done because the ca_registration.erb snippet that is used in the automated variants of these procedures updates the RHSM certificate as well. These changes are based on this fact.

[ShimShtein]

ACK, makes sense to me

[Lennonka]

Cherry-picked:

• 9bdbd22771..9ff8a34ffa 3.12 -> 3.12