SF-3754 Fix draft history blank on generate draft page when online

[RaymondLuong3]

The draft history list would not properly load if the user was initially offline when they navigated to the draft generation page. This change adds a subscriber to the online status service and triggers loading the history when a user returns online while on the draft generation page.

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This change is 

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.90%. Comparing base (ec63e78) to head (48673ac).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3906   +/-   ##
=======================================
  Coverage   80.90%   80.90%           
=======================================
  Files         631      631           
  Lines       40681    40684    +3     
  Branches     6595     6600    +5     
=======================================
+ Hits        32912    32915    +3     
  Misses       6729     6729           
  Partials     1040     1040           

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[pmachapman]

@pmachapman reviewed 2 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on RaymondLuong3).