rusk-wallet: Replace `test-wallet` in `rusk` tests

[moCello]

Summary

Test the functionalities of the rusk-wallet by plugging it into the tests of rusk.

Currently rusk used a test-wallet for its tests but that was always meant to be a temporary solution. Now that the rusk-wallet is a workspace member of rusk it makes sense to deprecate the test-wallet and use the rusk-wallet for the rusk tests.