Restore cleanup after e2e tests

[enarha]

Changes

The cleanup command was unintentionally commented out. Restoring the cleanup, so we don't have to do it manually after each run.

/kind misc

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[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sayan-biswas

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[sayan-biswas]

Apologies. This came from my previous PR where I was working on adding e2e tests. Thanks @enarha.

[sayan-biswas]

/lgtm