Persist FractionalIndices with two separate arrays for i, j

[simone-silvestri]

The fact that GPU tests do not run is starting to have quite a price on the development process.

close #370

[glwagner]

The fact that GPU tests do not run is starting to have quite a price on the development process.

close #370

I don't agree that its "starting" to have a price. From the very moment the tests stop working, way pay the price. It doesn't take any time.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 36 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (fa37f3c) to head (9c0cc89).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rfaceComputations/interpolate_atmospheric_state.jl	0.00%	20 Missing ⚠️
...dels/InterfaceComputations/component_interfaces.jl	0.00%	16 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #371   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         38      38           
  Lines       2354    2368   +14     
=====================================
- Misses      2354    2368   +14     

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