fix: preserve spend signatures in getCompressionSignaturesForAccount

[ananas-block]

• Add in_accounts and batch_nullify_context hashes to kept_account_hashes in filter_by_known_trees, so spend transaction entries are not filtered out
• Remove filter in v2 parser that excluded input accounts also present in outputs, making v2 consistent with v1 behavior

Overview

• Summary of changes

Testing

• Testing performed to validate the changes

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✨ Finishing touches

🧪 Generate unit tests (beta)

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• Commit unit tests in branch jorrit/fix-get-compression-signatures-for-account-spend

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