Test

Move `fit_result` to `model_builder.py` and remove redundancies from CLV and MMM #800

Job	Run time
test_slow (tests/clv/models/test_beta_geo_beta_binom.py)	13m 5s
test (3.10, false, tests/mmm --ignore tests/mmm/test_tvp.py --ignore tests/mmm/test_budget_optimi...	10m 28s
test_slow (tests/clv/models/test_pareto_nbd.py)	9m 17s
test (3.10, false, tests/mmm/test_tvp.py tests/mmm/test_budget_optimizer.py tests/mmm/test_hsgp.p...	7m 10s
test_slow (--ignore tests/clv/models/test_beta_geo_beta_binom.py --ignore tests/clv/models/test_p...	5m 38s
test (3.10, false, tests/clv)	8m 34s
test (3.10, false, --ignore tests/mmm --ignore tests/clv)	5m 8s
test (3.12, true, tests/mmm --ignore tests/mmm/test_tvp.py --ignore tests/mmm/test_budget_optimiz...	11m 51s
test (3.12, true, tests/mmm/test_tvp.py tests/mmm/test_budget_optimizer.py tests/mmm/test_hsgp.py...	7m 48s
test (3.12, true, tests/clv)	10m 7s
test (3.12, true, --ignore tests/mmm --ignore tests/clv)	6m 18s
	1h 35m 24s

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