Using Default PD Attach Limit for Gen3 Machines

[sunnylovestiramisu]

What type of PR is this?
/kind bug

What this PR does / why we need it:
For backward compatibility we will not change the attach limit for Gen3 machines. For Hyperdisk, the customers can still use the node labels to override.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Using Default PD Attach Limit for Gen3 Machines

/assign @mattcary

[sunnylovestiramisu]

/retest

[k8s-ci-robot]

@sunnylovestiramisu: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2019	a9acfff	link	false	/test pull-gcp-compute-persistent-disk-csi-driver-e2e-windows-2019

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[mattcary]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mattcary, sunnylovestiramisu

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[sunnylovestiramisu]

/cherry-pick release-1.18

[k8s-infra-cherrypick-robot]

@sunnylovestiramisu: once the present PR merges, I will cherry-pick it on top of release-1.18 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.18

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[k8s-infra-cherrypick-robot]

@sunnylovestiramisu: new pull request created: #2094

In response to this:

/cherry-pick release-1.18

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