extrinsic failure is not handled by untrusted service

[brenzi]

running the TEEracle in dcap mode, there are 3 extrinsics to be sent by the Enclave:

1. registerQuotingEnclave
2. registerTcbInfo
3. registerDcapEnclave

the main process does not realize if these extrinsics fail, if they are included in the block, but yield an extrinsicFailure like this here:
https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Frococo.api.integritee.network#/explorer/query/0xe052ea7fd2169bb9e4617cc1a44bec2a566836efe419075a7e6dd9ea392bab63

most likely this is because of wrong use of substrate-api-client

this bug is not critical because nothing bad can happen, but it makes debugging harder than necessary