1

ドアを開ける時ノブが上がりきっていたら誰かが部屋に入った可能性がある

This part is from Death Note.

Is this musu stem(連用形) + きって (te form of くる)?
If so, how is it different from 上がってきって?

2

The verb you're seeing is 上がり切る【きる】, not 上がり来る【くる】. (The te-form of 来る is きて, not きって.) 切る in a compound verb often means "thoroughly" or "fully". (食べ切る, 買い切る, 読み切る, ...)

ノブが上がりきっていたら
if the doorknob has fully moved up, ...

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