Add tests to packet poller

[bogdanvbalan]

resolves https://github.com/kubeshark/worker/issues/856
resolves https://github.com/kubeshark/worker/issues/868

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 11.97%. Comparing base (96caf7d) to head (927acc2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/bpf/tls_stream.go	0.00%	1 Missing ⚠️
pkg/decodedpacket/decoded_packet.go	0.00%	1 Missing ⚠️
socket/event_unix_socket.go	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (57.14%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage    8.93%   11.97%   +3.04%     
==========================================
  Files          59       59              
  Lines        6538     5301    -1237     
==========================================
+ Hits          584      635      +51     
+ Misses       5925     4628    -1297     
- Partials       29       38       +9     

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