Fix: two phase tuning not working as intended regarding process_result

[LucasDedieu]

Description

The results of Phase 2 do not include the optimal values of the frozen hyperparameters from Phase 1.

To resolve this, we need to retrieve the results from Phase 1 and merge them with those from Phase 2.

Until this issue is fixed, it is recommended to set two_phase_tuning=False in your config.yml.