Remove updating disk type for existing disks

[Sneha-at]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
The variable diskTypeForMetric is currently being overwritten when we check for existing disks in Create Volume calls. Removing the assignment for diskTypeForMetric in Create volume while validating existing disk.
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
This is related to PR #1227
Does this PR introduce a user-facing change?:

Bugfix for empty disk type being registered in metric for Create volume function.

[k8s-ci-robot]

Hi @Sneha-at. Thanks for your PR.

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[mattcary]

Update the release note (something like "Bugfix for blank disk type in volume creation metric").

[msau42]

/ok-to-test

[msau42]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: msau42, Sneha-at

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[sunnylovestiramisu]

/cherry-pick release-1.10

[k8s-infra-cherrypick-robot]

@sunnylovestiramisu: new pull request created: #1267

In response to this:

/cherry-pick release-1.10

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[sunnylovestiramisu]

/cherry-pick release-1.9

[k8s-infra-cherrypick-robot]

@sunnylovestiramisu: new pull request created: #1268

In response to this:

/cherry-pick release-1.9

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sunnylovestiramisu]

/cherry-pick release-1.8

[k8s-infra-cherrypick-robot]

@sunnylovestiramisu: new pull request created: #1269

In response to this:

/cherry-pick release-1.8

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.