Dont purge all the flows to aquila everytime

[Knerio]

Currently we just pass in all the flows:

message FlowResponse {
  oneof data {
    // Updates a single flow
    shared.ValidationFlow updated_flow = 1;
    // Deletes a single flow
    int64 deleted_flow_id = 2;
    // Replaces all flows in Aquila (only on startup and for releases)
    shared.Flows flows = 3; // We pass all flows, also if we only update one flow in here
  }
}

https://github.com/code0-tech/tucana/blob/5fa6b02ed70c70b326390b30bda89c3d22e31ca3/proto/sagittarius/sagittarius.flow.proto#L21

but when we are updating we should pass the updated flow(s) in here

message FlowResponse {
  oneof data {
    // Updates a single flow
    shared.ValidationFlow updated_flow = 1; // We should pass flow updates here
    // Deletes a single flow
    int64 deleted_flow_id = 2;
    // Replaces all flows in Aquila (only on startup and for releases)
    shared.Flows flows = 3;
  }

https://github.com/code0-tech/tucana/blob/5fa6b02ed70c70b326390b30bda89c3d22e31ca3/proto/sagittarius/sagittarius.flow.proto#L17

This isnt an issue but we should still fix that