test(ci): skip non-deterministic expand::test_avm_test_contract snapshot

[AztecBot]

Why

merge-train/fairies-v5 (#23881) keeps getting kicked out of the merge queue by
expand::test_avm_test_contract in noir-projects/contract-snapshots:

• http://ci.aztec-labs.com/0a451e58e2f5f2e9 (08:15 UTC)
• http://ci.aztec-labs.com/2d2f9eb018798a47 (13:29 UTC)

This is not a stale snapshot. The committed .snap is correct, and the diff
is ordering-only — the same generated interface functions (call_fee_juice,
nested_call_large_calldata, new_nullifier) shuffle position with identical
bodies/selectors.

Root cause: nargo expand emits the macro-generated contract-interface functions
in hashmap-iteration order, which is not stable across nargo builds/runs.
Evidence:

• On the branch tip with the pinned nargo 1.0.0-beta.22, the suite passes
  40/40 with the committed ordering, including in the merged-with-v5-next
  context the merge queue tests.
• The failing merge-queue commit had the same committed snapshot blob and the
  same noir submodule pin as the passing tip, yet the queue runner generated the
  opposite ordering and failed.

So the test fails intermittently in the merge queue purely on order-only diffs,
blocking the train.

What

Skip only expand::test_avm_test_contract in the contract-snapshots test
target (cargo test -- --skip ...). All other 60 snapshot tests still run. This
is narrower than the ci-skip label, which would disable the entire CI run.

Revert condition

Temporary. Re-enable once nargo expand produces deterministic interface-function
ordering (e.g. sort by name/selector) in noir. The skip carries a TODO pointing at noir-lang/noir#12933

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Created by claudebox · group: slackbot