Fix tinkerbell airgapped e2e tests

[panktishah26]

Description of changes:

TestTinkerbellAirgappedKubernetes128BottleRocketRegistryMirror
TestTinkerbellAirgappedKubernetes128BottlerocketProxyConfigFlow
TestTinkerbellAirgappedKubernetes128UbuntuProxyConfigFlow

Above e2e tests always used to download 1.24 kube version image and/or used to fail with below error,

❌ Validation failed {"validation": "tinkerbell Provider setup is valid", "error": "missing kube version from OSImageURL: url=http://10.80.18.122:8080/bottlerocket.img.gz, version=1.28", "remediation": ""}

This PR fixes this issue.

Testing (if applicable):

Documentation added/planned (if applicable):

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a1dbf9c) 71.56% compared to head (bde5991) 71.56%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7117   +/-   ##
=======================================
  Coverage   71.56%   71.56%           
=======================================
  Files         545      545           
  Lines       42323    42323           
=======================================
  Hits        30288    30288           
  Misses      10343    10343           
  Partials     1692     1692           

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[d8660091]

/lgtm

[panktishah26]

/cherry-pick release0.18

[eks-distro-pr-bot]

@panktishah26: once the present PR merges, I will cherry-pick it on top of release0.18 in a new PR and assign it to you.

In response to this:

/cherry-pick release0.18

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[eks-distro-bot]

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[eks-distro-pr-bot]

@panktishah26: cannot checkout release0.18: error checking out release0.18: exit status 1. output: error: pathspec 'release0.18' did not match any file(s) known to git

In response to this:

/cherry-pick release0.18

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.

[panktishah26]

/cherry-pick release-0.18

[eks-distro-pr-bot]

@panktishah26: new pull request created: #7119

In response to this:

/cherry-pick release-0.18

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.