feat(test-client-clis): tolerate missing trace file for rejected txs

[leolara]

🗒️ Description

Fix FileNotFoundError in fill --traces when a transaction is rejected mid-processing (e.g. EIP-3607 collision).

When T8N's run_state_test catches an EthereumException from process_transaction, the tx is added to rejected_txs and state is rolled back — but a receipt entry is still produced by Result.update → get_receipts_from_output. Meanwhile the tracer's TransactionEnd event never fires, so no trace file is written. collect_traces then iterates receipts, assumes a matching trace file exists for each, and crashes on shutil.copy / TransactionTraces.from_file.

This patch makes collect_traces tolerant of a missing trace file: when the file isn't on disk, record an empty TransactionTraces and continue. This matches the implicit empty-trace case that already exists for tests with no transactions, and leaves downstream verify-traces comparison symmetric (both sides produce empty traces for rejected txs).

Reproducer (before this PR)

TMPDIR=./.tmp uv run fill \
  tests/ported_static/stCreateTest/test_transaction_collision_to_empty_but_code.py \
  tests/ported_static/stCreateTest/test_transaction_collision_to_empty_but_nonce.py \
  tests/ported_static/stEIP3607/test_init_colliding_with_non_empty_account.py \
  --traces -n 4 --output .tmp/fix --clean
# → 117 failed (FileNotFoundError on .../trace-0-0x<hash>.jsonl)

After this PR: 117 passed.

CI was not catching this because the just fill recipe does not pass --traces.

Scope

One function (TransitionTool.collect_traces in packages/testing/src/execution_testing/client_clis/transition_tool.py), ~6 added lines. No changes to T8N, tracer, or receipt generation — those still warrant a follow-up correctness fix (emit TransactionEnd from the exception path) but are out of scope here.

🔗 Related Issues or PRs

N/A.

✅ Checklist

• All: Ran fast static checks to avoid unnecessary CI fails, see also Code Standards and Enabling Pre-commit Checks:

  just static

• All: PR title adheres to the repo standard - it will be used as the squash commit message and should start type(scope):.
• All: Considered updating the online docs in the ./docs/ directory.
• All: Set appropriate labels for the changes (only maintainers can apply labels).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.26%. Comparing base (40461a6) to head (6cad084).
⚠️ Report is 1 commits behind head on forks/amsterdam.

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #2709   +/-   ##
================================================
  Coverage            86.26%   86.26%           
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  Files                  599      599           
  Lines                37038    37038           
  Branches              3795     3795           
================================================
  Hits                 31949    31949           
  Misses                4525     4525           
  Partials               564      564           

Flag	Coverage Δ
unittests	86.26% <ø> (ø)

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[spencer-tb]

LGTM!