Improve order_cycle_distributed_products

[luisramos0]

What we should change and why (this is tech debt)

order_cycle_distributed_products.rb is assuming that products can have no variants and that master variants can be added to OCs. These assumptions are incorrect and we should update the code to reflect these facts:

• there should be no products without variants
• there should be no master variants in order cycles
  We need to clear the code and the data if applicable.

Additionally, there may be other parts of the code that would also benefit from being reviewed in terms of these assumptions.

Context

Raised as part of #3581