Use RequeueAfter after instead of Requeue

### What happened?

With the update to K8s version 1.35, Requeue is now deprecated, we need to explictly define when to requeue.

https://github.com/kubeflow/spark-operator/blob/e2ee1635c1675c28c9002d50b40fbb9f30543cb6/.golangci.yaml#L51-L56

### Reproduction Code

_No response_

### Expected behavior

_No response_

### Actual behavior

_No response_

### Environment & Versions

- Kubernetes Version:
- Spark Operator Version:
- Apache Spark Version:

### Additional context

_No response_

### Impacted by this bug?

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Start by reviewing the linked .golangci.yaml lines and locating the controller code that uses Requeue. Identify each affected requeue path, define the intended delay with RequeueAfter, and run the repository's existing checks to confirm the deprecation warning is resolved.

Written by the indexing model from the issue text.