Resolve warnings in the integration tests

[AlanGreene]

Changes

Resolve warnings related to git tree being in a dirty state by removing the kustomize binary and tar from the root of the tree.

See for example https://prow.tekton.dev/view/gs/tekton-prow/pr-logs/pull/tektoncd_dashboard/3438/pull-tekton-dashboard-integration-tests/1795417163817816064

2024/05/28 11:40:07 git is in a dirty state
Please check in your pipeline what can be changing the following files:
?? kind.yaml
?? kustomize
?? kustomize_v5.3.0_linux_amd64.tar.gz

/kind misc

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• [ ] Tests included if any functionality added or changed
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