Adding new values.yaml file for postsubmits perf tests

[utka]

It is copy of values-istio-test.yaml with decreased resources. I applied changes to my test cluster and all pods are OK.

Also fixed small typo in values-istio-test.yaml

[istio-testing]

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[utka]

/assign @mandarjog

[utka]

/assign @mandarjog

[utka]

/assign @mandarjog

[mandarjog]

/lgtm

[istio-testing]

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