Removes the `MachineVMV1` and `MonitorV1` structures that have been
deprecated for a long enough period of time that it makes sense to no
longer support them.
Results in the removal of deprecated `getSocketAndPid` as well.
The migration code was added in commit
`6e0e1cbddd5e1c5dff51215ad2b41a99d890fad8` and made it into release `v4.1.0`
[NO NEW TESTS NEEDED]
Signed-off-by: Jake Correnti <jakecorrenti+github@proton.me>