Summary:
1. [Path] sections do not belong in the .service files. We could have moved them
into a .path file, but that only controls the automatic activation of a unit file. Because
we manage this directly, we do not get much use - and we are not losing functionality
since these directives are currently ignored anyways
2. Updated standardoutput/error directives to use journal over syslog - syslog is now
deprecated, and we are expected to use journal
Test Plan: itests pass
Reviewers: anijhawan, nsingh, muthu
Reviewed By: nsingh
Differential Revision: https://phorge.dev.yugabyte.com/D45931