fix(auto-scale): Multi cluster image pull support (backport #4418)

[mergify]

We have registry mirrors setup and individual clusters might (or might not) have their own docker registry url

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This is an automatic backport of pull request #4418 done by Mergify.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.09%. Comparing base (bd04402) to head (56c4264).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...ess/doctype/auto_scale_record/auto_scale_record.py	0.00%	2 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4419      +/-   ##
==========================================
- Coverage   51.10%   51.09%   -0.01%     
==========================================
  Files         833      833              
  Lines       66309    66310       +1     
  Branches      286      286              
==========================================
  Hits        33884    33884              
- Misses      32397    32398       +1     
  Partials       28       28              

Flag	Coverage Δ
dashboard	71.98% <ø> (ø)

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