[SERVER-60388] ShardingWriteRouter GBenchmark Doesn't Utilize registerClientObserver - MongoDB Jira

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Recently, an invariant was added to require a locker instance. It was done for ~~SERVER-59618~~.

We need to add a line before creating the operation context in the benchmarks to register the client observer. Such as:

    auto serviceContext = ServiceContext::make();

    const auto client = serviceContext->makeClient("test");

    serviceContext->registerClientObserver(std::make_unique<LockerMongosClientObserver>());

    const auto opCtx = client->makeOperationContext();

is related to

SERVER-58960 Measure the overhead from ShardingWriteRouter on the write codepath

SERVER-59618 Avoid using LockerNoop outside of unit tests

related to

SERVER-60691 benchmark_main does not register ClientObserver for LockerNoop