fix(wasi): Memory leak due to cyclical WasiControlPlane references #3643
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Fixed by WasiProcess just storing a Weak<> handle to the control plane.
Note: This could/should also be changed so that the WasiProcess does not
have a handle to the control plane at all, but that requires some
slightly bigger refactoring that also changes or removes the SignalHandlerAbi
Closes #3642