Fixing image repo secret extraction for unloading worker pod

[yevgeny-shnaidman]

image repo secret wasd previously extracted from the volume that was mapped into the loading pod. Since the volume no longer exists, we must extract it from the imagePullSecret of the loading pod

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[yevgeny-shnaidman]

/assign @ybettan

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.59%. Comparing base (fa23a9b) to head (35ce7d1).
Report is 144 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #930      +/-   ##
==========================================
- Coverage   79.09%   72.59%   -6.51%     
==========================================
  Files          51       65      +14     
  Lines        5109     5743     +634     
==========================================
+ Hits         4041     4169     +128     
- Misses        882     1395     +513     
+ Partials      186      179       -7     

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[ybettan]

/lgtm

[yevgeny-shnaidman]

/cherry-pick release-2.2

[k8s-infra-cherrypick-robot]

@yevgeny-shnaidman: new pull request created: #931

In response to this:

/cherry-pick release-2.2

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