Jedd/cnx 590 resolve raceconditions where event handlers use the browser

[JR-Morgan]

• Fix tests
• Test a little more in connectors

[linear]

CNX-590 Resolve raceconditions where event handlers use the browser before binding is fully setup

[codecov]

Codecov Report

Attention: Patch coverage is 59.70149% with 27 lines in your changes missing coverage. Please review.

Project coverage is 8.99%. Comparing base (0c5b5ed) to head (b7bfcdb).

Files with missing lines	Patch %	Lines
...UI3/Speckle.Connectors.DUI/Bridge/BrowserBridge.cs	0.00%	21 Missing ⚠️
...rs.DUI/Bindings/TopLevelExceptionHandlerBinding.cs	0.00%	4 Missing ⚠️
...I3/Speckle.Connectors.DUI/Bridge/SyncToUIThread.cs	0.00%	1 Missing ⚠️
....Connectors.DUI/Bridge/TopLevelExceptionHandler.cs	92.30%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             dev    #287      +/-   ##
========================================
+ Coverage   8.33%   8.99%   +0.65%     
========================================
  Files        243     243              
  Lines       4857    4893      +36     
  Branches     569     570       +1     
========================================
+ Hits         405     440      +35     
  Misses      4435    4435              
- Partials      17      18       +1     

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[JR-Morgan]

Adam has suggested that an Event Aggregator pattern may also be a potential solution here.
I think this could be cleaner, so I'll give it a POC.