chore: Replace testify with gotest.tools in staking integration tests (#14504)

testutil/assertHelpers.go

@@ -0,0 +1,25 @@
+package testutil
+
+import "testing"
+
+func AssertPanics(t *testing.T, f func()) {
+	panicked := false
+	defer func() {
+		if r := recover(); r != nil {
+			panicked = true
+		}
+	}()
+	f()
+	if !panicked {
+		t.Errorf("should panic")
+	}
+}
+
+func AssertNotPanics(t *testing.T, f func()) {
+	defer func() {
+		if r := recover(); r != nil {
+			t.Errorf("should not panic: %v", r)
+		}
+	}()
+	f()
+}