Android's BalancesIntegrationTest CI fetches this fixture directly
from raw.githubusercontent.com/.../master/tests/chains_for_testBalance.json,
but it never existed in this repo's output - only chains/, xcm/,
icons/, and staking/ were ever synced from nova-base by
sync_from_nova.py. This is why "Run balances tests" in
pezkuwi-wallet-android has been failing (FileNotFoundException) even
after fixing its CI infra and instrumentation-runner issues.
Only this one fixture is published from nova-base/tests/, not the
rest of that directory (upstream's own pytest suite for validating
its chains.json output, unused by anything in this repo or its
consumers).
