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While I cannot be sure of the eggs, I think it is definitely an issue with pests like aphids or mites. The ants are simply attracted the honeydew the insects secrete. I would treat the tree with neem oil, which will take care of the pests, as well as the ants. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Cherry trees are not normally propagated from cuttings, but you can try a hardwood cutting method. This article will help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-root-cuttings-from-various-shrubs-bushes-and-trees.htm

Planting cherry trees requires well-drained, fertile soil. Cherry trees are very susceptible to root rot, so the soil needs to be well-drained. They also require about eight hours of sunlight daily. Also, it's important to plant them in higher ground.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-improve-clay-soil.htm

Planting in spring is best and fall comes in a close second.

This article will help determine if the tree is still alive: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

As for its care, this article should help: https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm

The Bing cherry does not necessarily have to have another tree for pollination, but it will produce more fruit on the tree year after year if there is another fruiting cherry nearby. The bees should be able to pollinate the Bing flower to flower without a second cherry tree nearby. However, you may want to consider planting another one anyway (Rainier or Stellaare good choices). This article may also be helpful: https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm