Handle multiple include globs for SLES 15

[FcoCalero]

Summary

• model the vendor ssh/sshd include directives for SLES 15 as distinct entries so the fixtures match the platform templates
• teach the ssh client and server templates to render multiple Include lines and avoid managing include directories when arrays are supplied

Testing

• bundle exec rake spec (fails: Could not find gem 'voxpupuli-test (= 6.0.0)' in locally installed gems)

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https://chatgpt.com/codex/tasks/task_e_68e50ce202788328b4997cd0a7a8db5f