Multisend for calls only should not allow ˋDELEGATECALLˋ operation

[clemsos]

Description

When creating a multicall transaction with only calls, the operation should not return a ˋDELEGATECALL` operation, as the multisend function of the MultiSendCallOnly contract does not allow it.

https://github.com/safe-global/safe-smart-account/blob/main/contracts/libraries/MultiSendCallOnly.sol#L55

When onlyCalls flag is set in createTransaction, the operation for the calls should always be 0.

Environment

• Safe Core SDK version:
• Safe contract version:
• Environment:
  • non-browser: hardhat

Steps to reproduce

• Parse a set of calls to a proxy using ˋsafe.createTransactionˋ with ˋonlyCallsˋ flag set to true
• Execute the tx in a safe

The tx will revert as the 1 operation is not allowed

Expected result

Multisend should execute all txs properly.

Additional context

Tested a with passing operation CALL to all packed txs and it worked, while using ˋoperation: 1ˋ fails.