chore(tools): update tooling config for v6 prefix

[zeroedin]

Summary

Phase 0.2

• Generalize eslint ignore glob for icon demo path to handle both pf-v5-icon and pf-v6-icon
• Update eslint no-missing-package-exports rule to match only pf-v6-* element directories
• Remove all pf-v5-* export entries from elements/package.json — v6 release will not ship v5 elements
• Bump elements package version to 6.0.0-next.0
• Audited tsconfig, web-test-runner, playwright, and commitlint configs — no changes needed

Closes #3130

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Latest commit: 2a5b7ca

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{
  "valid": true,
  "errors": [],
  "warnings": [],
  "input": "chore(tools): update tooling config for v6 prefix"
}

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[zeroedin]

@bennypowers, we have a .config/cem.yaml in the elements dir, and another in the root. It is my assumption that the one in the elements dir needs to be removed. Not sure why that wouldn't just sit at the root? It was causing problems with the agents running. Thoughts?