[release-0.19] Add check for nil eksaversion when setting etcd url

[eks-distro-pr-bot]

This is an automated cherry-pick of #8018

/assign vivek-koppuru

[eks-distro-bot]

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

I'm waiting for a aws 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[vivek-koppuru]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vivek-koppuru

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[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-0.19@355de0a). Click here to learn what that means.

Files	Patch %	Lines
pkg/providers/tinkerbell/template.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##             release-0.19    #8032   +/-   ##
===============================================
  Coverage                ?   73.53%           
===============================================
  Files                   ?      588           
  Lines                   ?    37186           
  Branches                ?        0           
===============================================
  Hits                    ?    27344           
  Misses                  ?     8049           
  Partials                ?     1793           

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[rahulbabu95]

/override govulncheck

[eks-distro-bot]

@rahulbabu95: /override requires failed status contexts, check run or a prowjob name to operate on.
The following unknown contexts/checkruns were given:

• govulncheck

Only the following failed contexts/checkruns were expected:

• eks-anywhere-cli-attribution-presubmit
• eks-anywhere-generate-files-presubmit
• eks-anywhere-presubmit
• tide

If you are trying to override a checkrun that has a space in it, you must put a double quote on the context.

In response to this:

/override govulncheck

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.