[Release-1.32] Add auto import images for containerd image store

[vitorsavian]

• backport

• PR -> Auto import images for containerd image store #10973

• Issue -> [Release-1.32] - Auto-import images into the embedded registry while k3s is running #11559

[codecov]

Codecov Report

Attention: Patch coverage is 45.20548% with 120 lines in your changes missing coverage. Please review.

Project coverage is 47.68%. Comparing base (9d31106) to head (9cb28dc).
Report is 1 commits behind head on release-1.32.

Files with missing lines	Patch %	Lines
pkg/agent/containerd/watcher.go	46.63%	79 Missing and 24 partials ⚠️
pkg/agent/containerd/containerd.go	34.61%	11 Missing and 6 partials ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.32   #11563      +/-   ##
================================================
- Coverage         49.30%   47.68%   -1.62%     
================================================
  Files               184      185       +1     
  Lines             19029    19231     +202     
================================================
- Hits               9382     9171     -211     
- Misses             8302     8739     +437     
+ Partials           1345     1321      -24     

Flag	Coverage Δ
e2etests	40.57% <45.20%> (-2.84%)	⬇️
inttests	35.07% <19.17%> (-0.04%)	⬇️
unittests	17.06% <0.00%> (-0.19%)	⬇️

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