Add Brute Force Tests

[lumapools]

Description

Added tests for PR #239 by @GiacomoFrn.

The new tests check that:

• The brute force gives gives the same results are ground_state_hamitonian
• The brute force method raises an error when the QAOA is uncompiled
• If bounded=True we do not brute force for a number of qubits > 25

(Closed my previous PR #240 due to synchronization issues)

Type of change

• Test addition

Name the new unit-tests that you have added along with this change.
In test_workflows.py: Added test_qaoa_brute_force