chore(codeowners): make Platform owner of infra files [PLAT-7118]

[claire-mn]

Summary

Implements PLAT-7118 for this repo. Opened as a draft.

Transformation

• Add @teamsnap/platform + @teamsnap/quality as owners of .github/**.
• Add @teamsnap/platform as co-owner of infra/** and .teamsnap/** (where present; existing owners kept).
• Add the CODEOWNERS self-ownership line (@teamsnap/platform + primary team).
• * catch-all owner unchanged. File kept at repo root.

Access validity

Push access for the new owners is granted in companion PR terraform-deployments#2479. Owners are honored by GitHub once that PR merges & applies. All owners verified with the update-codeowners skill verifier.

Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a3b04596-9f93-4d40-a140-509fa413c48c

📥 Commits

Reviewing files that changed from the base of the PR and between eb7598b and 2e4293e.

📒 Files selected for processing (1)

• CODEOWNERS

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch c6/PLAT-7118-codeowners

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