Something is wrong with the bookkeeping of processes in `ProcessManager`.
If I repeat a pipeline run before the environment was cleaned up (which would
happen after 30s?), the process manager will find that a process with the id
already exists, and fail.
```
Caused by: java.lang.IllegalStateException: There was already a process running
with id 1
at
org.apache.beam.runners.fnexecution.environment.ProcessManager.runCommand(ProcessManager.java:78)
```
[ Full content available at: https://github.com/apache/beam/pull/6287 ]
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