tests: Rename resources directory to data
This allows to drop the datadir fixture override and realign with other loader tests.
Related to T2481
Test Plan
tox
Migrated from D3449 (view on Phabricator)
This allows to drop the datadir fixture override and realign with other loader tests.
Related to T2481
tox
Migrated from D3449 (view on Phabricator)