Performance benchmarks: Built-in and standalone plugin variations

[hariso]

Feature description

The usage of built-in vs standalone plugins affects performance test results (built-in ones affect Conduit's resource usage, standalone plugins incur the cost of gRPC usage). We should have variations of performance tests, where both built-in and standalone plugins are used.

[uchennakevinm1]

Not an urgent issue for this iteration, will punt!