remove timeafter linter

[rolinh]

As stated in the time package documentation, The issue highlighted by the timeafter linter is no longer a concern with Go versions >= 1.23:

Before Go 1.23, this documentation warned that the underlying Timer
would not be recovered by the garbage collector until the timer fired,
and that if efficiency was a concern, code should use NewTimer instead
and call Timer.Stop if the timer is no longer needed. As of Go 1.23,
the garbage collector can recover unreferenced, unstopped timers.
There is no reason to prefer NewTimer when After will do.

Given that the currently supported versions of Go are 1.24 and 1.25, this linter is no longer needed.