Get rid of traffic reservation logic in the SV app

[canton-network-da]

[ This issue was auto-migrated from DA's internal repo (DACH-NY/canton-network-node#12019). Original author: @parth-da ]

We do not have traffic top-ups for SVs anymore. This is just dead code that is lying around and can be removed.

[canton-network-da]

[ from @martinflorian-da ]: Pointer: start from here