[release-0.17] Get previous disk usage only from existing machine configs

[eks-distro-pr-bot]

This is an automated cherry-pick of #6699

/assign abhay-krishna

[eks-distro-bot]

Hi @eks-distro-pr-bot. Thanks for your PR.

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[abhay-krishna]

/lgtm
/ok-to-test
/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhay-krishna

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.17@0100084). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
##             release-0.17    #6700   +/-   ##
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  Coverage                ?   75.51%           
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  Files                   ?      455           
  Lines                   ?    37917           
  Branches                ?        0           
===============================================
  Hits                    ?    28633           
  Misses                  ?     7674           
  Partials                ?     1610           

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