[feature] Spark operator should use Pod Identity

[alanty]

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What is the outcome that you are trying to reach?

EKS has released Pod Identities to help manage IAM rights for pods https://docs.aws.amazon.com/eks/latest/userguide/pod-identities.html
The Spark operator solution still uses IRSA but it would be great to have it use Pod Identity instead

[github-actions]

This issue has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this issue will be closed in 10 days

[github-actions]

Issue closed due to inactivity.

[alanty]

this is still an issue, forgot to label it. reopening.