Support special resource unit for VPA

[jiangpengcheng]

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Motivation

1. the ratio of CPU and Memory should keep the same, e.g. if the cpu is increased to 400m, the memory also needs to increase to 1600Mi
2. the resource must increase at least 200m and 800Mi, e.g. if the cpu should be 211m, we need to increase it to 400m

but with the default vpa updater, we cannot do that, so create this PR to fit for our charging model

Modifications

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Verifying this change

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This change is a trivial rework / code cleanup without any test coverage.

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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[illegalnumbers]

I took a look at this change and it seemed straightforward to me. I don't have a lot of context on this though, @freeznet or @nlu90 would be better to approve it. Also, the unit tests are still failing.