Disable worker heartbeating via ENV var
Disable worker heartbeating via ENV var

Allows disabling worker heartbeats for workers that are running in
isolation or where communicating via DRB is not possible.

The method of hearting will most likely be refactored in the future, but
this allows for efforts to spin up workers without `rake evm:start`
being done and activating a drb server to handle heartbeating.

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