Installer: add support for algoh to systemd installs

[onetechnical]

Summary

The systemd setup right now does not support algoh installs, which can be useful for additional diagnostic information. This PR will replace launching algod with algoh.

Usage (e.g.):

./systemd-setup.sh -H ubuntu ubuntu

The -H option has to come first. This will replace occurences of algod with algoh in the systemd file.

Note that because of this, output from algod would no longer be recorded to syslog. This should be fine, because algoh usage is typically for servers that have enabled telemetry, and node.log remains in use.

Test Plan

Verified installation works both with and without -H. Verified killing algoh or algod restores service.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.90%. Comparing base (23a04c2) to head (9efeafd).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6102      +/-   ##
==========================================
- Coverage   56.25%   55.90%   -0.35%     
==========================================
  Files         490      490              
  Lines       69699    69699              
==========================================
- Hits        39206    38967     -239     
- Misses      27825    28061     +236     
- Partials     2668     2671       +3     

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