cuttlefish: Wire up Netsim UDS socket (--grpc_uds_path) - #2851
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Exposes `enable_netsim_nfc()` on CuttlefishConfig instead of netsim_radio_enabled
to simplify netsim nfc checking, avoiding passing --grpc_uds_path unconditionally.
Bug: 525044943
Test: bazel build //base/cvd/cuttlefish/...
TAG=agy
CONV=97998051-73aa-44c8-83ac-51de8d5fd83d
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Inject GrpcSocketCreator into NetsimServerComponent (NetsimServer) and pass --grpc_uds_path=<instance_dir>/grpc_socket/NetsimControlServer.sock when launching netsimd.
This establishes the Unix Domain Socket communication path required for local gRPC service discovery and control (such as CasimirControlService and ServerReflection) while keeping --netsim_nfc disabled by default (#define CF_DEFAULTS_NETSIM_NFC false).
Objective: Verify that adding GrpcSocketCreator and --grpc_uds_path introduces zero regressions to default Cuttlefish behavior and cleanly establishes the Unix Domain Socket when explicitly opted into via --netsim_nfc=true.
Phase 1.1: Local Build & Unit/Host Presubmits
Test: m run_cvd
Bug: 526689247