Temporarly ignore the ASAN build failure in wallet_assumeutxo

Summary: ASAN is triggered upon node shutdown in this test and it needs to be investigated. Let's ignore this exact error for now so we can continue rely on the ASAN test for all the new code.

Test Plan: Run the asan build.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17961