worker: expect plan-level <error> for errored tmt plan

Miroslav Vadkertirequested to merge
per-plan-error-reason-and-logs into main

gluetool-modules!1073 (merged) surfaces per-plan errors as an <error> element on the xUnit <testsuite>. A plan where tmt completes but reports an error result now carries <error message="tmt errored out" .../> linked to the tmt-log, emitted before <logs>.

Update the expected results.xml for the tmt-multihost-invalid-provision-how worker test to include this element.

Assisted-by: Claude Code Signed-off-by: Miroslav Vadkerti mvadkert@redhat.com

Edited by Jan Havlín

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