Add ELK4N4 to organization and observability-wg

[ELK4N4]

Summary

• Add ELK4N4 as an organization member in members.csv
• Add ELK4N4 to the observability-wg team in team-members/observability-wg.csv

Test plan

• Confirm ELK4N4 appears once in members.csv with role member
• Confirm ELK4N4 appears once in team-members/observability-wg.csv with role member
• After merge, verify OpenTofu apply succeeds and membership is reflected in the org

Made with Cursor

[coderabbitai]

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_{Comment @coderabbitai help to get the list of available commands.}

[masayag]

/lgtm