Remove duplicate permissions check

[jakduch]

Summary

• remove the temporary duplicate permissions health check role
• stop running the check for Katello and Satellite flavors
• remove the obsolete check documentation

Merge timing

This is intentionally a draft. Foreman #11271 must be released, and the supported upgrade path must no longer need the safeguard, before this can be merged.

Testing

• parsed both modified flavor files as YAML
• ran ansible-lint on both modified flavor files
• verified no check_duplicate_permissions references remain
• ran git diff --check

Fixes #849

This pull request was prepared with assistance from OpenAI Codex.

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[jakduch]

The failing deployment jobs hit the Candlepin heap/OOM problem fixed on current master by #865. I rebased this branch onto that fix; CI is running again.