[Access] check for correct err in ReadJSON method

[illia-malachyn]

Closes #7045
Branched off #6641

Removed websocket.ErrCloseSent in favor of websocket.CloseError

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.97468% with 166 lines in your changes missing coverage. Please review.

Project coverage is 41.15%. Comparing base (8665c07) to head (d4d0bda).
Report is 593 commits behind head on master.

Files with missing lines	Patch %	Lines
...s/rpc/backend/transaction_subscription_metadata.go	64.03%	31 Missing and 10 partials ⚠️
engine/access/rest/common/utils.go	47.91%	24 Missing and 1 partial ⚠️
cmd/access/node_builder/access_node_builder.go	0.00%	17 Missing ⚠️
cmd/observer/node_builder/observer_builder.go	0.00%	17 Missing ⚠️
.../access/rpc/backend/backend_stream_transactions.go	72.13%	12 Missing and 5 partials ⚠️
engine/access/rest/websockets/controller.go	62.79%	15 Missing and 1 partial ⚠️
engine/access/rest/util/converter.go	0.00%	8 Missing ⚠️
.../rest/websockets/data_providers/events_provider.go	28.57%	4 Missing and 1 partial ⚠️
access/api.go	0.00%	4 Missing ⚠️
...ockets/data_providers/account_statuses_provider.go	40.00%	2 Missing and 1 partial ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #7065     +/-   ##
=========================================
  Coverage   41.15%   41.15%             
=========================================
  Files        2132     2139      +7     
  Lines      187058   188557   +1499     
=========================================
+ Hits        76975    77595    +620     
- Misses     103635   104464    +829     
- Partials     6448     6498     +50     

Flag	Coverage Δ
unittests	41.15% <57.97%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Guitarheroua]

Looks good!