feat(pod): retrieve real container name from pod cache

[vimalk78]

• use pod cache in pod informer to get container name as in kubernetes cluster
• added tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.40%. Comparing base (18630a0) to head (f375f4c).
Report is 14 commits behind head on reboot.

Additional details and impacted files

@@            Coverage Diff             @@
##           reboot    #2162      +/-   ##
==========================================
+ Coverage   91.36%   91.40%   +0.04%     
==========================================
  Files          36       36              
  Lines        3473     3490      +17     
==========================================
+ Hits         3173     3190      +17     
  Misses        232      232              
  Partials       68       68              

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