Mod TerminateAsync return type UniTaskVoid and remove parameter CancellationToken

[nowsprinting]

Changes

Mod Autopilot.TerminateAsync return type from UniTask to UniTaskVoid.
And remove parameter CancellationToken.

Generally, use the TerminateAsync method with Forget().
Also, this prevents accidents such as accidentally passing a CancellationToken and canceling the termination.

I changed the method signature because I couldn't attach ObsoleteAttribute to the arguments, but since it's an internal method, I don't think I need to mark it as a "breaking changes".

Priority

Very low

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[asurato]

LGTM