Raise proper Pulp errors from failing tasks

[dark3rMatt3r]

Problem

Raw, non-Pulp exceptions escaping the task runner (_execute_task) log a pulpcore.deprecation "will be sanitized" warning and would lose their messages under REDACT_UNSAFE_EXCEPTIONS in 3.130. Because the deprecations CI job asserts that log is empty, these leaks turn every PR's run red. This is the general form of the (already-closed) #7910.

Offending paths and fixes — each now raises a PulpException subclass:

• finalize_replication raised a bare Exception; now raises ReplicateError, extended with an optional details arg to keep the failed-subtask summary (backward compatible).
• The replicate task let raw requests HTTPErrors escape when contacting the upstream (e.g. the 404 schema fetch); these are now wrapped in ExternalServiceError, matching the existing SSL handling.
• The generic delete tasks (general_delete/general_multi_delete/ageneral_delete) let Django ProtectedError escape; they now raise the new ProtectedResourceError (PLP0029), extending the DoesNotExist handling from Update delete task to skip over already deleted objects #7930.
• The failing_task/afailing_task test tasks raised RuntimeError; they now raise a PulpException subclass so their messages survive redaction. The task-purge fixture uses that task instead of sleep(-1).

ProtectedResourceError is exported from pulpcore.exceptions and the pulpcore.plugin.exceptions plugin API.

Testing

• Functional suite passes with 0 server-side "will be sanitized" warnings (the exact gate signal).
• New unit tests (pulpcore/tests/unit/tasking/test_delete_tasks.py) cover the ProtectedError → ProtectedResourceError conversion for all three delete tasks.

Notes

• replica.py now imports requests (present transitively via pulp-glue) — happy to add it to pyproject.toml if preferred.

Root-cause writeup: dark3rMatt3r#1

📜 Checklist

• Commits are cleanly separated with meaningful messages (simple features and bug fixes should be squashed to one commit)
• A changelog entry or entries has been added for any significant changes
• Follows the Pulp policy on AI Usage
• (For new features) - User documentation and test coverage has been added

See: Pull Request Walkthrough

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