Fix red develop 10cc641b3867

The merge lane found `develop` red at `10cc641b38672d36a48c7621d5ad7a2c86650426` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `check-quarantine-selftest` - `quarantine-lane-selftest` - `mirror-trees-strict` - `community-edition-tooling-suite` - `mirror-sensitive-content-suite` The whole gate log: artifact `12668` on lane task 11585. Make `develop` pass its full gate again. Open a PR as usual: the merge lane merges a PR that fixes some of these and adds no failure even while `develop` is red.

Fixed red develop: quarantine selftest now scans the whole dc test) case; removed internal task refs from QATrail/PaneHeader comments. Quick gate + affected suites green; PR #7435 queued to merge lane. Memory: none applied.