ci: temporarily disable qa-assets unit tests
ci: temporarily disable qa-assets unit tests

These "pass" locally but in CI they download pre-signed transactions
from https://github.com/bitcoin-core/qa-assets/ which we need to
fork and recreate.

Essentially these files are the output of the Taproot functional
test (which passes), so I am not too worried about actual failures
here. But we should wait until after the Taproot sighash is finalized
to recreate these assets.

ElementsProject/elements,ElementsProject/elements,ElementsProject/elements,ElementsProject/elements,ElementsProject/elements,ElementsProject/elements