test(e2e): keep G14 multi-set restart graceful (#7633)

test(e2e): keep multi-set restart graceful

Include the EC8+4 multi-set restart scenario in the graceful interruption lane so the unclean-shutdown marker assertion matches the scenario semantics.

Co-authored-by: zhi22915 <qiuzgang@gmail.com>

crates/e2e_test/src/heal_erasure_disk_rebuild_test.rs

@@ -1823,6 +1823,7 @@ mod tests {
                 scenario,
                 InterruptionScenario::BackgroundTargetRestart
                     | InterruptionScenario::BackgroundTargetRestartEc84
+                    | InterruptionScenario::BackgroundTargetRestartEc84MultiSet
                     | InterruptionScenario::BackgroundCoordinatorRestart
             ) {
                 cluster.stop_node_gracefully(interruption_node).await?;