[CI] Add preferCached for docker-startup commands
#244766
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Summary
Add
preferCachedas an option in the test util for starting docker images, turn it on for all EPR image pulls, in order to prevent costly docker pulls in FTRs/integration tests.After #244517 we still have a small temporal zone in between an agent being provisioned and the tests being ran, where a promotion would trigger a docker pull, that depletes disk space, it also would make pulls slow, and potentially time out tests.
This PR suggests, we should always use the cached variant (for EPR at least). With this, the above risk zone is no longer causing pulls, it's just that we are still testing the previously promoted and cached image, probably not risky.