Avoid that a Pod update removes the container metadata

[mariomac]

Fixes: #1152

After a Pod update event, the container metadata was removed but never restored, so the PIDs<->Pod information was lost.

[grcevski]

LGTM!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.82%. Comparing base (487a85a) to head (fc0f1f5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1156      +/-   ##
==========================================
- Coverage   81.96%   81.82%   -0.14%     
==========================================
  Files         141      136       -5     
  Lines       11595    11287     -308     
==========================================
- Hits         9504     9236     -268     
+ Misses       1563     1529      -34     
+ Partials      528      522       -6     

Flag	Coverage Δ
integration-test	57.48% <ø> (+0.27%)	⬆️
k8s-integration-test	59.38% <ø> (+0.30%)	⬆️
oats-test	36.03% <ø> (-0.83%)	⬇️
unittests	53.88% <ø> (+1.44%)	⬆️

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