ci: remove repo-card auto-updater stub

[jordins]

This repo is public, but the REPO_CARD_UPDATER_* org secrets are scoped to private
repositories only. The reusable workflow declares the OpenAI API key as a required secret,
so it can never resolve here — every scheduled run fails at compile time before any job starts.

Removing the stub stops the recurring failures. If we later decide these public repos should get
card refreshes, we can re-add the stub once the secrets are shared to public repos (or the
reusable workflow is made fail-soft on a missing key).

MIX-181

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4a5ffcc6-8da7-4407-92c5-c05373c477b2

📥 Commits

Reviewing files that changed from the base of the PR and between 6f483c1 and 8c58a62.

📒 Files selected for processing (1)

• .github/workflows/refresh-repo-card.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jordins/MIX-181/remove-repo-card-stub

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[leonardoll-mixmax]

Repo-card auto-updater stub removal, uniform single-file deletion across repos. LGTM.