Was/is Yashua ha Mashiach Torah (the Law) Incarnate?
I don't know how to answer this. I would say he is the incarnation of messianic prophecy (found in the Law of Moses). If this is what we are talking about, then he is. Your further questions to me will assume this as the meaning for now.
In what way has the Law been done away with?
The Old Covenant, containing the Mosaic law, is done away with. However, since the perfect standard of righteousness was
formally given through the Mosaic law, comprehended under the Ten Commandments, it isn't done away with. It is our moral obligation to fulfill that perfect standard of righteousness before God, which is clearly embedded in our conscience since creation, but distorted and blurred from the fall. This
formal written code of moral truth convicts our dead conscience of right from wrong, and places us under the judgment of it. We are truly condemned under that legal declaration.
The Law of Moses, contained in the Old Covenant, properly deals with the nation of Israel and their covenant relationship with God in the land of Canaan. It conditioned the enjoyment of their existence in Canaan. If you obeyed it, as a Jew at that time, you were blessed. If you did not obey it, you were cursed with many maledictions. Until a throne was established, people were judged on individual basis. When the throne was established, God making his covenant with David and his offspring, they were judged according to the faithfulness of their king (as well as their own to some extent).
The New Covenant, which Christ brought, is what the Old Covenant promised and typified. It properly deals with eternal things, as opposed to temporal things; with the eternal kingdom, instead of an temporal kingdom; with a spiritual people, instead of an carnal/ethnic people; with better promises than all that would have been enjoyed in Israel as a nation in this life. True forgiveness of sins could not be attained under the Old Covenant system, only the forgiveness of transgressions committed against that particular covenant agreement with weak and temporal sacrifices from animal. These sacrifices not only atoned for sins committed against God under this Old Covenant in a temporal and external way, they pointed forward to the one True Sacrifice that atoned for sin itself before a holy God (the spiritual reality).
An unbelieving Jew could enjoy all the promises of God under the Mosaic law, and still die in their sins, because that particular covenant dealt with the carnal blessings made to Abraham, Isaac, and Jacob.
It is commonly misunderstood that because Jesus was Jewish, under the Mosaic law, that his obedience to that particular law was necessary for him to bring about the New Covenant. What is meant by him being born under the law refers to the perfect standard of God's righteousness revealed through the Mosaic law. Since it is impossible to separate the perfect standard from the Law of Moses itself, they are termed the same thing often, because they are interconnected with each other. Jesus obeyed the perfect standard of righteousness revealed in the Law of Moses (active obedience) and suffered for the sins of sinners who are condemned under that perfect standard of righteousness (passive obedience). These were prerequisite for him to bring about the New Covenant, made between him and the Father in eternity past. These were his conditions, as the Law of Moses was for Israel's kings, in order to bring about every blessing in the New Covenant to all of us in him. He earned perfect righteousness, we in him share in that status by faith, uniting with him by faith. He earned reconciliation with God and the forgiveness of sins, we share in that by faith, uniting with him by faith. The New Covenant did not do away with the Old, rather it was the fulfillment of the Old and the purpose/end of the Old. Once Christ came, it was ready to disappear for the official establishing all the promises of God in him by way of covenant.
In what way was the Law Incarnate forsaken by the Father?
God poured out his wrath against him, body and soul, what we would suffer in eternity. Since he was perfect God and perfect man, he was able to suffer for man and endure the whole weight of that eternity in
three hours. God treated him as a sinner, or as the Scriptures say, "He was numbered among the transgressors."
If the Law was forsaken, killed, and buried...was it/He not also resurrected?
He was resurrected. If he did not rise, we would not be saved, because...
1. He would not have earned the title of Victor in our place, being dead.
2. He would not have credited/imputed that righteousness, being dead.
...among other things.
The Law of Moses, or Jesus? The latter is sitting at the right hand of God, interceding for all his elect with his precious blood, ready to come and bring the whole world into judgment. The former, in your bibles.