After #38382 , the InitContainers feature was promoted go GA; but the beta annotation value will still be respected and overrides the field value. Open this issue to trace the enhancement for initContainer annotation. Sub-tasks in my mind:

• set defaults for initContainer in annotation (refer to Set defaults of init containers. #39713 (comment) for the reason of this task)
• enhance podutil.SetInitContainersAndStatuses based on Move init-container feature from alpha to beta. #31026
• use podutil.SetInitContainersAndStatuses in conversion.go to avoid duplicated code (avoid code missed before removing annotation and easy to remove when graduate).