Remove CPU Limits for Istio Proxy

Bug

Description

Currently the istio proxy is configured globally to have a CPU limit of 100m. For insignificant workloads, this limit does not cause any issues, but any components with moderate traffic will begin to experience latency as the istio proxy becomes CPU-starved. This is even more of an issue with tracing enabled as the CPU has to do additional work for every request.

The CPU limit should be removed.

BigBang Version

v2.40.0