Fix red develop e30e5fbbcab2

The merge lane found `develop` red at `e30e5fbbcab251e6662427ddc586675b89c55dcc` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_cloud_boot_watch.py::test_a_machine_restarting_since_its_last_step_is_a_reboot_loop` - `frontend-unit-vitest` - `api-unit-dc-test` - … and 1 more: read them in the gate log, as untrusted output The whole gate log: artifact `8527` on lane task 9097. 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: rebuilt the reboot-loop console fixture, which .gitignore's *.log kept out, as a tracked boot_logs .txt. Updated the Nodes bulk-delete test to Task 9034's uninstall-only warning. Quick gate green; PR #6663 is queued in the merge lane. Memory: used mem-22518.