refactor: preheat with multi arch image layers

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #2864 (7d4ec96) into main (39a15e1) will increase coverage by 0.09%.
The diff coverage is 85.98%.

@@            Coverage Diff             @@
##             main    #2864      +/-   ##
==========================================
+ Coverage   51.53%   51.63%   +0.09%     
==========================================
  Files         162      161       -1     
  Lines       21851    21809      -42     
==========================================
  Hits        11262    11262              
+ Misses       9922     9885      -37     
+ Partials      667      662       -5     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	51.63% <85.98%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
manager/job/types.go	80.00% <84.61%> (+49.23%)	⬆️
manager/job/preheat.go	54.74% <86.17%> (+11.58%)	⬆️

... and 2 files with indirect coverage changes