[Release-1.30] Add auto import images for containerd image store

[vitorsavian]

• backport

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

• Issue -> [Release-1.30] - Auto-import images into the embedded registry while k3s is running #11557

[codecov]

Codecov Report

Attention: Patch coverage is 46.08696% with 124 lines in your changes missing coverage. Please review.

Project coverage is 46.69%. Comparing base (5cd95dc) to head (69f1e79).
Report is 1 commits behind head on release-1.30.

Files with missing lines	Patch %	Lines
pkg/agent/containerd/watcher.go	47.54%	82 Missing and 25 partials ⚠️
pkg/agent/containerd/containerd.go	34.61%	11 Missing and 6 partials ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.30   #11561      +/-   ##
================================================
- Coverage         48.21%   46.69%   -1.52%     
================================================
  Files               184      185       +1     
  Lines             19187    19400     +213     
================================================
- Hits               9251     9059     -192     
- Misses             8583     9029     +446     
+ Partials           1353     1312      -41     

Flag	Coverage Δ
e2etests	40.37% <46.08%> (-2.54%)	⬇️
inttests	18.56% <0.00%> (-16.34%)	⬇️
unittests	16.92% <0.00%> (-0.17%)	⬇️

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