Add data inputs as arguments into function

[byersiiasa]

Similarly here, wouldn't it make sense to add the cumulative emissions, quantiles and Energy Intensity files as input arguments to the function?

message-ix-buildings/message_ix_buildings/chilled/functions/regression.py

Line 58 in 6cde97d

os.path.join(version_output_path, "engage_emissions_tempAR6_cumCO2.xlsx")

message-ix-buildings/message_ix_buildings/chilled/functions/regression.py

Lines 75 to 77 in 6cde97d

	EI_cumCO2 = pd.read_csv(
	os.path.join(version_output_path, "region_EI_cumCO2_pre-regress.csv")
	)

Further down, the scenario names could be automatically inferred i.e.
scenarios = engage_cumCO2.scenario.unique()

message-ix-buildings/message_ix_buildings/chilled/functions/regression.py

Line 66 in 6cde97d

scenarios = ["EN_NPi2020_300f", "EN_NPi2020_1400f", "EN_NPi2100"]

@measrainsey