Snapshot: prohibit to change cli flags (#3311)

cmd/downloader/main.go

cmd/integration/commands/flags.go

cmd/integration/commands/stages.go

cmd/rpcdaemon/cli/config.go

cmd/sentry/sentry/sentry.go

cmd/utils/flags.go

eth/backend.go

eth/ethconfig/config.go

eth/ethconfig/gen_config.go

eth/stagedsync/stage_headers.go

eth/stagedsync/stage_senders.go

ethdb/prune/storage_mode.go

ethdb/prune/storage_mode_test.go

go.mod

go.sum

turbo/app/snapshots.go

turbo/snapshotsync/block_snapshots.go

turbo/snapshotsync/block_snapshots_test.go

turbo/snapshotsync/snapshotsynccli/flags.go

turbo/stages/stageloop.go