disable podInformer in external-resizer

[huww98]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

We never return InUse error, so this should have no impact. This should greatly reduce the memory consumption, so shrink the limits.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

The memory footprint of provisioner is greatly reduced.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

Hi @huww98. Thanks for your PR.

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[mowangdk]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huww98, mowangdk

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