Test loadscope recovery after worker failure

[GruffElixir]

Fixes #1378

Add a regression test for loadscope scheduling after a worker crash. Tests: python -m pytest testing/test_dsession.py -q

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[GruffElixir]

The new LoadScope regression test passes in the matrix and locally. The only failures are the two pytest-main jobs, where existing LoadGroupScheduling acceptance tests fail against the current pytest development build; all pytestlatest jobs and the other matrix jobs pass. This appears to be an upstream compatibility issue rather than a failure in the added regression test. Could a maintainer confirm whether the pytest-main jobs should be rerun or treated separately?

[GruffElixir]

Rebased onto master and dropped the obsolete grouped-node-ID workaround now that upstream passes group names separately. The regression test and changelog are unchanged. Validation: 49 scheduler/worker tests and both loadgroup integration tests passed, along with all pre-commit hooks.