Run the served rotation's verb on the bus chain the controller keeps, as its child process does (issue 1945)

cmd/mesh-controller/composed_served_integration_test.go

@@ -460,6 +460,9 @@ func TestServedARotationRewritesOnlyTheCompositionsThatUseIt(t *testing.T) {
 	before := map[string]map[string]uint64{"anchor": m.revisions(t, "anchor"), "laptop": m.revisions(t, "laptop")}
 	holders, _ := m.open.inventory.HoldersOf(t.Context(), "postgres-database", "")
 	var waited uint64
+	// The verb runs here as its child process runs it: its inventory takes the chain from the bus the served controller keeps it
+	// on (the registrations and assignments are there), not the one in memory the fixture's store was made with.
+	inventory.OnTheBusChainForTest(t)
 	said, err := capturedOutput(func() error {
 		if err := rotateCommand(t.Context(), []string{"postgres-database"}); err != nil {
 			return err