Check spawned worker version vs node version before PVF preparation (#6861)

* Check spawned worker version vs node version before PVF preparation

* Address discussions

* Propagate errors and shutdown preparation and execution pipelines properly

* Add logs; Fix execution worker checks

* Revert "Propagate errors and shutdown preparation and execution pipelines properly"

This reverts commit b96cc3160ff58db5ff001d8ca0bfea9bd4bdd0f2.

* Don't try to shut down; report the condition and exit worker

* Get rid of `VersionMismatch` preparation error

* Merge master

* Add docs; Fix tests

* Update Cargo.lock

* Kill again, but only the main node process

* Move unsafe code to a common safe function

* Fix libc dependency error on MacOS

* pvf spawning: Add some logging, add a small integration test

* Minor fixes

* Restart CI

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Co-authored-by: Marcin S <[email protected]>