fix(drive): import nullifier constants instead of duplicating them

[QuantumExplorer]

Issue being fixed or feature implemented

NULLIFIERS_KEY_U8 and COMPACTED_NULLIFIERS_KEY_U8 were defined locally in verify modules instead of importing from saved_block_transactions::queries. If the canonical value changes, these local copies would silently diverge, breaking proof verification.

What was done?

Replaced local constant definitions with imports from crate::drive::saved_block_transactions.

How Has This Been Tested?

• cargo check -p drive — compiles cleanly

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

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