Fix potential deadlock broadcasting to a closed WS connection

[peterbroadhurst]

Port of hyperledger/firefly-transaction-manager#28 to EthConnect codebase, which shares this WS socket management code.

[codecov-commenter]

Codecov Report

Merging #226 (a863493) into main (a2a305b) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head a863493 differs from pull request most recent head 33c4340. Consider uploading reports for the commit 33c4340 to get more accurate results

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
- Coverage   97.23%   97.20%   -0.03%     
==========================================
  Files          70       70              
  Lines        7660     7663       +3     
==========================================
+ Hits         7448     7449       +1     
- Misses        163      164       +1     
- Partials       49       50       +1     

Impacted Files	Coverage Δ
ethconnect/internal/events/logprocessor.go	98.31% <0.00%> (-1.69%)	⬇️
ethconnect/internal/ws/wsserver.go	100.00% <0.00%> (ø)

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