Add error handling for channels which fail to be created in `funding_transaction_generated_intern`#3029

TheBlueMatt merged 2 commits intolightningdevkit:mainlightningdevkit/rust-lightning:mainfrom

TheBlueMatt:2024-04-fix-batch-funding-failuresTheBlueMatt/rust-lightning:2024-04-fix-batch-funding-failuresCopy head branch name to clipboard