syz-fuzzer: remove ipc gate

Ipc gate slows down overall execution a lot.
Without ipc gate I am getting ~20% more executions with debug kernel
and ~100% more executions with a fast non-debug kernel.

Replace ipc gate with explicit tracking of last executing programs
per proc in syz-manager.
Ipc gate was also used for leak checking, but leak checking seems
to be still broken. At least in my local runs I am not getting
any leaks even with the previous fix.
So remove the gate completly for now. Taking into account that
we are likely to rewrite this code in C++ soon, it makes
little sense to create a special gate for leak checking only in Go.

Update #4728

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