I think the obvious reason your interpretation is wrong (and Jesus obviously didn’t “commit suicide”, which as you point out is a mortal sin, which is another obvious piece of evidence that God Himself did not commit it, since God never sins)…
Is that Jesus didn’t kill himself. Soldiers killed him.
And Jesus didn’t walk towards the circumstances that resulted in his own death because he wanted death for the sake of dying. He walked humbly towards the circumstances that resulted in his own death for the sake of his friends.
Foresight of a consequence doesn’t mean the consequence is the thing you really want.
That is, Jesus accepted being executed by others… but only out of love for God and his friends, and he didn’t seek out his own death for its own sake. Judas betrayed Jesus to the Romans, and Jesus makes it very clear in his prayers in the garden of Gethsemane that He doesn’t want to die, but will humbly submit to it if his death (by means of unjust persecution by the Jewish leaders, and execution by Romans, which comes only as a result of Jesus’ determination to honestly preach the gospel, which these hearers rejected and murdered him for) is part of God’s will for how humankind will be saved.
I get how if you use the loosest possible interpretation of an idea that’s kinda-sorta-almost-close-to ‘suicide’, thinking of it only in terms of “Dying when one could have technically escaped dying if they chose to disobey God and prioritize their own life over the life of another”… then you might end up with the conclusion you have.
But that’s not actually what suicide is.