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Since I don't know what kind of tree it is, I'm going to guess that it's a pine tree. You need to prune it to remove the dead branches and needles. Here's an article with tips: https://www.gardeningknowhow.com/ornamental/trees/pine/pine-tree-pruning.htm

Yes, you should remove it. The tree must have been grafted and a stem from below the graft is growing. Always remove suckers as soon as you see them so they don't overtake the tree.

https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-sucker-removal-and-tree-sucker-control.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/can-grafted-trees-revert-to-their-root-stock.htm

Since you have the plant I would go ahead and plant it. Ideally, you shouldn't plant when it is that hot, but leaving it in the container outside all summer seems worse to me. The only thing is: don't forget about it. In this temperature, it will need to be watered more often till it is established. I would water every couple of days to start. Also, if the sun is blazing hot all day with no clouds, you might consider a shade cloth for a few weeks for part of the day.

I would research these possibilities: drought stress, poor soil conditions, high humidity (may be causing fungal diseases), canker or pests like aphids.

You didn't mention whether this is a baby tree, a bare root tree or a mature tree, but generally speaking, it's best to plant either in the fall or during the tree's dormant season. This article should help:
https://www.gardeningknowhow.com/ornamental/trees/tgen/how-and-when-to-plant-trees.htm

We do not sell anything, unfortunately. We only provide information on gardening. It is unwise to put your personal information out to the public, so I will remove it for you, this time.

Here are some articles that will help you to grow Spruce once you find them:

https://www.gardeningknowhow.com/ornamental/trees/spruce