test: add preheat e2e testing for v2

[gaius-qi]

Description

Related Issue

dragonflyoss/client#398

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

All modified and coverable lines are covered by tests ✅

Project coverage is 52.77%. Comparing base (0657d32) to head (6c837b7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3215      +/-   ##
==========================================
+ Coverage   51.98%   52.77%   +0.78%     
==========================================
  Files         173      192      +19     
  Lines       19382    20341     +959     
==========================================
+ Hits        10076    10735     +659     
- Misses       8599     8802     +203     
- Partials      707      804      +97     

Flag	Coverage Δ
unittests	52.77% <ø> (+0.78%)	⬆️

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see 20 files with indirect coverage changes