Do not close a.eventStream, rather handle closed batch dispatcher

[peterbroadhurst]

Fix for #182

[codecov-commenter]

Codecov Report

Merging #183 (2c82118) into main (d74a775) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
- Coverage   97.23%   97.10%   -0.14%     
==========================================
  Files          57       57              
  Lines        6811     6813       +2     
==========================================
- Hits         6623     6616       -7     
- Misses        144      150       +6     
- Partials       44       47       +3     

Impacted Files	Coverage Δ
ethconnect/internal/events/eventstream.go	96.61% <0.00%> (-1.69%)	⬇️
ethconnect/internal/kafka/kafkabridge.go	96.00% <0.00%> (-1.34%)	⬇️

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