Update flows partition calculation

[datejada]

The current partition calculation calculates the flow partition (resolution) as the maximum value between two assets:

Tulipa-OBZ-CaseStudy/utils/functions.jl

Line 125 in 533fa59

function process_flows_rep_period_partition_file(

Tulipa-OBZ-CaseStudy/utils/functions.jl

Line 150 in 533fa59

row.partition = max(from_partition[1], to_partition[1])

However, for storage assets, the incoming and outgoing flow resolution should be calculated as the minimum between the connecting asset and the storage resolution. For example, if a "hydro" storage asset with a resolution of 24h (daily balance) is connected to a hub with hourly resolution (1h), then the partition/resolution of flows from (to) the hub to (from) the storage asset should be hourly, too.

Assigning the maximum is not wrong, but it underestimates the flexibility of the storage asset.