enhancement(agentctl): add inspect flag in test-logs cmd

[fgouteroux]

PR Description

Hi,

I would like to add the --inspect flag from promtail to grafana-agentctl test-logs command, like explain in the doc.

$ grafana-agentctl test-logs -h

Starts Promtail using its '--dry-run' flag, which will only print logs instead of sending them to the remote server.
		This can be useful for debugging and understanding how logs are being parsed.

Usage:
  agentctl test-logs [config file] [flags]

Flags:
  -h, --help      help for test-logs
  -i, --inspect   Allows for detailed inspection of pipeline stages.

PR Checklist

• CHANGELOG.md updated
• Documentation added
• Tests updated
• Config converters updated

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[fgouteroux]

Hello, any chance to get this merged ?