Skip Foreman task checks on proxy backups

[jakduch]

Summary

• run Foreman task preflight checks only on hosts with the foreman feature
• keep Pulp task checks enabled for content proxy backups
• document the server/proxy distinction and guard it with a regression test

Testing

• ansible-lint src/roles/backup
• targeted feature-guard regression test
• git diff --check

Fixes #790

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between acdb0f7 and 8c95876.

📒 Files selected for processing (3)

• docs/user/backup-restore.md
• src/roles/backup/tasks/preflight.yaml
• tests/unit/check_role_test.py

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[jakduch]

The timer failures are outside this proxy-backup change and occur under the same resource pressure that killed services in the shared CI runs. #865 limits the Candlepin heap for development tuning and has passed the complete CI matrix.