test: add range request e2e testings for dfdaemon proxy

[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 52.01%. Comparing base (76dd8a1) to head (16837f6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3208   +/-   ##
=======================================
  Coverage   52.01%   52.01%           
=======================================
  Files         173      173           
  Lines       19382    19382           
=======================================
  Hits        10081    10081           
  Misses       8594     8594           
  Partials      707      707           

Flag	Coverage Δ
unittests	52.01% <ø> (ø)

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