Support Loadouts for Party Tab Build import

Check for duplicates

• I've checked for duplicate open and closed issues by using the search function of the issue tracker

What platform are you running Path of Building on?

Windows

Is your feature request related to a problem?

When making an aura bot you need to export the character with supports and copy it into the party tab build import after every change.

Describe the solution you'd like

Add a dropdown under build import inside the party tab that allows me to pick my other loadout of the same pob as the party build, so I can fiddle with the other loadout and see changes hopefully in real time and possibly show the dps impact of the main build after the aura bot changes

Describe alternatives you've considered

As said above it can be achieved by exporting after every change or getting a minion and taking its stats as if it applies to party allies.

Additional context

Would solve #9984 pretty much as well

Start by inspecting the Party tab build import and the existing loadout handling. Determine how another loadout from the same build can update the party build and its DPS impact in real time; done means the requested dropdown and synchronized behavior work without repeated export and import.