sled-agent: Remove direct dpd NAT entry creation in service zone startup path - #11073

control: job assigned to worker 01KZVV9JYGNMTF0JR9QGVME1AH [factory aws, i-00dd56b760dae6787] (queued for 47 s)
...
task: starting task 0: "setup"
task: process exited: duration 4087 ms, exit code 0
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task: starting task 1: "rust-toolchain"
task: process exited: duration 18030 ms, exit code 0
...
task: starting task 2: "authentication"
task: process exited: duration 16 ms, exit code 0
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task: starting task 3: "clone repository"
task: process exited: duration 12362 ms, exit code 0
...
task: starting task 4: "build"
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| info: running `cargo check --bins` on zone-setup (333/333)
| warning: profile package spec `blake2b_simd` in profile `dev` did not match any packages
| warning: profile package spec `rust-argon2` in profile `dev` did not match any packages
|     Checking uzers v0.12.2
|     Checking zone-setup v0.1.0 (/work/oxidecomputer/omicron/zone-setup)
|     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.68s
| 
| real    13:44.835540688
| user    20:47.044721552
| sys      4:13.230601722
| trap        0.324466166
| tflt        2.119218017
| dflt        1.499980093
| kflt        0.004610942
| lock  1:28:33.917881806
| slp   1:39:25.465760805
| lat        55.535720247
| stop     3:59.521390557
task: process exited: duration 954239 ms, exit code 0
|W| found 0 output files