add resource limit for my sql pod in case it cause oom on node

[azhao155]

We do see flakiness of test due to OOM issue, so add limit for mysql pod which consume the most memory in the integration test.

The flakiness test issue:#10130

[k8s-ci-robot]

Hi @azhao155. Thanks for your PR.

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[azhao155]

@medyagh

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