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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[andyzhangx]

/cherrypick release-1.33

[andyzhangx]

/cherrypick release-1.32

[andyzhangx]

/cherrypick release-1.31

[andyzhangx]

/cherrypick release-1.30

[k8s-infra-cherrypick-robot]

@andyzhangx: new pull request created: #2727

In response to this:

/cherrypick release-1.33

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: #2728

In response to this:

/cherrypick release-1.31

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: #2729

In response to this:

/cherrypick release-1.32

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: #2730

In response to this:

/cherrypick release-1.30

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.