List Windows Server versions supported for AD integration

[asteflova]

What changes are you introducing?

Let's list the tested and/or supported versions of Windows Server for integration with Active Directory.

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

We currently don't offer any guidance on which WS versions users can use for integration with Foreman.

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

N/A

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 6c7cc6d874cf21a2b5ded5e561f9e67453767c46 is available at theforeman-foreman-documentation-preview-pr-3293.surge.sh

The following output files are affected by this PR:

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

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[asteflova]

I asked for a review internally, but anyone is free to chime in with their opinion.