Cng orchestrator gem doctor command

What does this MR do and why?

• Adds doctor command to cng deployment orchestrator for all system dependency validation. - !151380 (e1920405)
• Adds improved output capabilities - !151380 (178ecde8)
• Adds wrapper for shell command execution for upcoming commands - !151380 (178ecde8)

Closes: gitlab-org/quality/quality-engineering/team-tasks#2648 (closed)

Part of: gitlab-org/quality/quality-engineering/team-tasks#2570

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