(T2) Use Concordium Client to send and receive GTU#12

pablozsc wants to merge 2 commits intomainpablozsc/Testnet3-Challenges:mainfrom

(T2)-Use-Concordium-Client-to-send-and-receive-GTUpablozsc/Testnet3-Challenges:(T2)-Use-Concordium-Client-to-send-and-receive-GTUCopy head branch name to clipboard