fix: set proper desiredSize when increasing minSize

[jose-ledesma]

Description of changes:

When desiredSize is managed by external autoscaling, the ACK EKS controller will not increase minSize if it exceeds desiredSize, instead reporting the following error:

  Conditions:
    Last Transition Time:  2025-09-02T12:59:44Z
    Status:                True
    Type:                  ACK.ResourceSynced
    Message:               InvalidParameterException: Minimum capacity 2 can't be greater than desired size 1
    Status:                True
    Type:                  ACK.Terminal

This PR ensures that when minSize exceeds desiredSize, the desiredSize will be automatically adjusted to match minSize, preventing the operation from failing and ensuring successful resource updating.

[ack-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ack-prow[bot]]

Hi @jose-ledesma. Thanks for your PR.

I'm waiting for a aws-controllers-k8s member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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