Render plan-level error reason and log link

Miroslav Vadkertirequested to merge
plan-level-error-display into main

Testing Farm now emits a plan-level <error> element on a <testsuite> when a plan fails before/without producing test cases (a crash) or when tmt completes but reports an error result. Render its message inline in the plan summary, with an optional link to the log of the failing phase (name -> href).

Add an <error> to the tmt-failed-prepare scenario to exercise it.

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

Merge request reports