Revert "feat(headless): add GetActionDataWithDefault generic func"

This reverts commit fa12e0d.

pkg/protocols/headless/engine/action_types.go

@@ -228,15 +228,3 @@ func (holder *ActionTypeHolder) MarshalJSON() ([]byte, error) {
 func (holder ActionTypeHolder) MarshalYAML() (interface{}, error) {
 	return holder.ActionType.String(), nil
 }
-
-// GetActionDataWithDefault gets the value associated with the given key from
-// the [ActionData]. If the value cannot be asserted to the specified type T or
-// the key does NOT exist, returns the provided default (def) value.
-func GetActionDataWithDefault[T any](data ActionData, key string, def T) T {
-	v, ok := data[key].(T)
-	if !ok {
-		v = def
-	}
-
-	return v
-}