Update BBR istio.yaml to use FULL_DUPLEX_STREAMED mode

[rramkumar1]

/assign @kfswain

[k8s-ci-robot]

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[ahg-g]

/ok-to-test

[danehans]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danehans, rramkumar1

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[danehans]

/lgtm