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I bought a new set of tyres (Continental Grand Prix 5000). Being an idiot, I managed to cut the sidewall of the tyre with a knife while removing the packaging.
I have looked at repairing it, and came across items such as the Park Tool TB-2 Tyre Boot. However, I noticed that these fixes are only meant to be temporary, and not permanent.
Is it safe and advisable to use a tyre boot to repair a new tyre which I plan to ride 3000-4000km on, or do I need to cut my losses and just buy a new one?
No, a tyre boot will absolutely not be enough. Some side cuts are repairable by stitching. However, it is better for MTB tyres that use smaller pressures. I do not know if it is likely to work on a road tyre.
As your gut feelings are telling you, no.
And unfortunately it's not even good as a trainer tyre. Unless you consider good "waking up your neighbours due to a loud bang in the middle of the night"!
Please consider the trigger for the failure (and the volume control for your booming alarm) is the pressure needed in such a small tyre. If you can run at 1 bar, you would be ok, the bang will not be that loud. But you would probably ruin the rim.
