TST: speed up and simplify preconditioned optimizer test by using EMT
This MR speeds up and simplifies the test set for new preconditioned optimiser by using EMT instead of the LJ calculator.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This MR speeds up and simplifies the test set for new preconditioned optimiser by using EMT instead of the LJ calculator.