test: ignore latest tgz file in helm chart index verification

[andyzhangx]

What type of PR is this?
/kind failing-test

What this PR does / why we need it:
test: ignore latest tgz file in helm chart index verification

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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• OWNERS [andyzhangx]

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[andyzhangx]

/cherrypick release-1.26

[andyzhangx]

/cherrypick release-1.25

[andyzhangx]

/cherrypick release-1.24

[andyzhangx]

/cherrypick release-1.23

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2145

In response to this:

/cherrypick release-1.26

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-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2146

In response to this:

/cherrypick release-1.25

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-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2147

In response to this:

/cherrypick release-1.24

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-sigs/prow repository.

[k8s-infra-cherrypick-robot]

@andyzhangx: #2144 failed to apply on top of branch "release-1.23":

Patch is empty.
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To record the empty patch as an empty commit, run "git am --allow-empty".
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"

In response to this:

/cherrypick release-1.23

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-sigs/prow repository.