FIX: make combine_list order-deterministic and drop the duplicated workaround

[Javier Valero (jav1er8)]

combine_list returns list(set(list1 + list2)), so the order of the result varies between processes under hash randomization:

['illegal', 'bias', 'violence', 'harmful', 'pii']
['pii', 'bias', 'violence', 'illegal', 'harmful']
['harmful', 'illegal', 'bias', 'pii', 'violence']

The codebase already knows

pyrit/models/seeds/seed_dataset.py carries a private _merge_unique whose docstring says:

Used instead of utils.combine_list because the latter goes through set() and is nondeterministic across processes for non-trivial inputs.

And the existing tests compare with set(result) == {...} rather than asserting a result, because there was no order to assert.

Changes

Use dict.fromkeys, which deduplicates while preserving first-occurrence order, and accept None as empty so the function covers everything _merge_unique did. _merge_unique is then removed and its single call site uses combine_list.

combine_list is public API, but moving from an arbitrary order to a defined one cannot break a caller that was already correct.

Tests now assert exact order, including a case that pins first-occurrence ordering across both arguments, and cover the None inputs.

Verification

• Repeated runs with PYTHONHASHSEED=random now return an identical result
• pytest tests/unit: 16955 passed, 126 skipped (16953 on main, +2 new tests, nothing broken)
• ruff format --check, ruff check: clean

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[Javier Valero (jav1er8)]

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