[Open311] Add --exclude to bin/open311-populate-service-list

[davea]

Allows bodies to be excluded from Open311 service list fetching.

This seemed like the simplest approach and matches what we do for bin/fetch. Other options I considered were adding a "skip service list fetch" checkbox to the body admin edit page, and adding a cobrand hook to allow cobrand to opt-out of service list fetching.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.49%. Comparing base (65b55d9) to head (caae438).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5177   +/-   ##
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  Coverage   82.48%   82.49%           
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  Files         406      406           
  Lines       31716    31716           
  Branches     5044     5044           
=======================================
+ Hits        26162    26164    +2     
+ Misses       4065     4063    -2     
  Partials     1489     1489           

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[dracos]

Is fine, though I guess to match fetch, we'd have bodies_exclude in the Populate package and do the exclusion in there, which would then make this testable as well. But is small thing.