Reduce AssignOperatorToMerchant complexity in MerchantDomainService#1610

StuartFerguson merged 3 commits intomasterTransactionProcessing/TransactionProcessor:masterfrom

copilot/reduce-cyclomatic-complexity-assign-operatorTransactionProcessing/TransactionProcessor:copilot/reduce-cyclomatic-complexity-assign-operatorCopy head branch name to clipboard