Introduce ttlSecondsAfterFinished to TestRun

[JunhoeKim]

Feature Description

The current TestRun resource cleans up resources used for the load test through the cleanup property. However, there is a need to be able to debug failed cases, and even when the load test is successfully completed, the resources may need to be retained for a certain period of time. How about adding the ttlSecondsAfterFinished property used in Job workloads to the TestRun object as well, to make resource management a little more flexible?

Suggested Solution (optional)

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Already existing or connected issues / PRs (optional)

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[yorugac]

Hi @JunhoeKim, thanks for opening the issue!

This sounds like a duplicate to https://github.com/grafana/k6-operator/issues/260 ?