Address review comment

Signed-off-by: Rashmi Gottipati <chowdary.grashmi@gmail.com>

api/v1alpha2/bundledeployment_types.go

@@ -78,6 +78,7 @@ type BundleDeploymentSpec struct {
 // PreflightConfig holds the config for the preflight checks. Currently, this is implemented for the
 // CRDUpgradeSafety preflight check and can be extended in the future to add other preflight checks.
 type PreflightConfig struct {
+	//+kubebuilder:Optional
 	CRDUpgradeSafety *CRDUpgradeSafetyPreflightConfig `json:"crdUpgradeSafety,omitempty"`
 }