Add release notes for 3.12-rc1

[ColeHiggins2]

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

Please cherry-pick my commits into:

• [ ] 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 0a669641de1a963ff73350ae7e928357a8c4c52f is available at theforeman-foreman-documentation-preview-pr-3236.surge.sh

The following output files are affected by this PR:

• Release_Notes/index-foreman-deb.html
• Release_Notes/index-foreman-el.html
• Release_Notes/index-katello.html
• Release_Notes/index-orcharhino.html
• Release_Notes/index-satellite.html

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[ColeHiggins2]

@ekohl do I need to update these notes as well to be categorized? or is this correct as is?