Update VolumeAttributesClass example to beta

[AndrewSirenko]

Is this a bug fix or adding new feature?
Update

What is this PR about? / Why do we need it?

The current ModifyVolume example will not work with aws-ebs-csi-driver version >= v1.35.0 due to the VolumeAttributesClass object upgrading to v1beta1 in Kubernetes v1.31 and external sidecars.

Also decreased volume size and iops to be more frugal.

Am open to updating modify-volume.md further to remove steps that are no longer relevant for aws-ebs-csi-driver >= 1.35.0 (i.e. adding feature gate on sidecars manually instead of relying on our helm chart)

What testing is done?
Going through example manually

[github-actions]

Code Coverage Diff

This PR does not change the code coverage

[torredil]

There are 2 instances of storage.k8s.io/v1alpha1 in https://github.com/kubernetes-sigs/aws-ebs-csi-driver/blob/master/docs/tagging.md - would now be a good time to update these as well? besides this, PR lgtm.

Thank you for continuing to maintain the documentation in this repo up to date.

[AndrewSirenko]

/retest

[ElijahQuinones]

/lgtm
Thanks for updating the docs Drew

[k8s-ci-robot]

@ElijahQuinones: changing LGTM is restricted to collaborators

In response to this:

/lgtm
Thanks for updating the docs Drew

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[ConnorJC3]

/approve

[k8s-ci-robot]

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