cmd,swarm: enforce camel case variable names (#19060)

cmd/swarm/config.go

cmd/swarm/config_test.go

cmd/swarm/flags.go

cmd/swarm/main.go

cmd/swarm/upload.go

swarm/api/act.go

swarm/api/api.go

swarm/fuse/swarmfs.go

swarm/fuse/swarmfs_unix.go

swarm/network/stream/peer.go

swarm/storage/ldbstore_test.go

swarm/swarm.go