e2e: add generator tests (#7008)

test/e2e/pkg/manifest.go

@@ -150,6 +150,11 @@ type ManifestNode struct {
 	UseLegacyP2P bool `toml:"use_legacy_p2p"`
 }
 
+// Stateless reports whether m is a node that does not own state, including light and seed nodes.
+func (m ManifestNode) Stateless() bool {
+	return m.Mode == string(ModeLight) || m.Mode == string(ModeSeed)
+}
+
 // Save saves the testnet manifest to a file.
 func (m Manifest) Save(file string) error {
 	f, err := os.Create(file)