SF-3758 Fix crash when two users have the same Paratext id, sanitize import draft crashes

[pmachapman]

This PR fixes the root cause of the issue (a regression introduced by SF-2788 Reduce calls to the Paratext Registry (#2529)), and updated the SignalR notification to not include a stack trace.

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This change is 

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.30%. Comparing base (5ffa804) to head (5d939f2).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...SIL.XForge.Scripture/Services/MachineApiService.cs	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3768   +/-   ##
=======================================
  Coverage   81.30%   81.30%           
=======================================
  Files         622      622           
  Lines       39382    39387    +5     
  Branches     6390     6414   +24     
=======================================
+ Hits        32019    32025    +6     
+ Misses       6378     6377    -1     
  Partials      985      985           

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[RaymondLuong3]

@RaymondLuong3 reviewed 4 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on pmachapman).

[Nateowami]

@pmachapman Can you update the title of the PR? I realize it's hard to title this well, but the actual changes are quite different from the title.

[pmachapman]

Can you update the title of the PR? I realize it's hard to title this well, but the actual changes are quite different from the title.

@Nateowami Is this title better?