Disable getting all secrets from ns by default

[Ashley-wenyizha]

Is this a bug fix or adding new feature?
Disable getting all secrets from namespace by default due to security concern
What is this PR about? / Why do we need it?

What testing is done?

[k8s-ci-robot]

Hi @Ashley-wenyizha. Thanks for your PR.

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[wongma7]

/ok-to-test
/lgtm
/approve

i would submita pr to master branch as well and update https://github.com/kubernetes-sigs/aws-efs-csi-driver/tree/master/examples/kubernetes/cross_account_mount to say that this permission must be added/uncommented in order for https://github.com/kubernetes-sigs/aws-efs-csi-driver/tree/master/examples/kubernetes/cross_account_mount to work

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Ashley-wenyizha, wongma7

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