[roll] Roll fuchsia [zircon][rust] Use Result<(), ErrorStatus> in syscalls

Update Zither's Rust kernel backend to generate Result<(), ErrorStatus>
for syscalls returning zx_status_t, replacing raw Status returns.

Add ErrorStatus as a transparent wrapper around NonZero<zx_status_t> in
the zx-status crate. Because ErrorStatus has a niche at 0 (ZX_OK),
Result<(), ErrorStatus> has the exact same 4-byte memory layout and
machine ABI as zx_status_t while allowing idiomatic error handling in
syscall implementations via the ? operator and .into() conversions.

Update the test syscalls in zircon/kernel/lib/syscalls/test.rs to use
Result<(), ErrorStatus> and silence FFI lints in the syscall macro.

Original-Original-Bug: 507423574
Test: fx clippy --all, fx build, fx core-tests
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1697174
Original-Original-Revision: 61c763af1dfcb95e9d7b8779605735f57c937a14
GitOrigin-RevId: d3fc11ff175bc89db606038cc68b1d1c96b2d56b
Change-Id: I446c39a25ae9f6080e6cbb6624768e2e874461fb
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1698115
Cr-Commit-Position: refs/heads/main@{#196414}