Containerize Remote Execution section

[AkshayGadhaveRH]

JIRA:wq
https://redhat.atlassian.net/browse/SAT-41055

What changes are you introducing?

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

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

Contributor checklists

• 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 3.19/Katello 4.21
• Foreman 3.18/Katello 4.20 (Satellite 6.19; orcharhino 7.9)
• Foreman 3.17/Katello 4.19
• Foreman 3.16/Katello 4.18 (Satellite 6.18; orcharhino 7.6, 7.7, and 7.8)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4; orcharhino 7.5)
• We do not accept PRs for Foreman older than 3.14.

[github-actions]

The PR preview for 22bfd4a is available at theforeman-foreman-documentation-preview-pr-5093.surge.sh

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[adamruzicka]

Should this also address how the plugin can be enabled in containerized deployments where it is not enabled by default?

Something along the lines of an additional ifdef and {{foremanctl}} --add-feature remote-execution in guides/common/modules/proc_installing-the-remote-execution-plugin.adoc