feat: add NewSafeDialer and fix ssrf in manager preheat api

[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 #2611 (cecc1c4) into main (9cc9fa2) will decrease coverage by 0.13%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2611      +/-   ##
==========================================
- Coverage   51.55%   51.42%   -0.13%     
==========================================
  Files         158      158              
  Lines       21050    21072      +22     
==========================================
- Hits        10852    10837      -15     
- Misses       9569     9605      +36     
- Partials      629      630       +1     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	51.42% <0.00%> (-0.13%)	⬇️

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

Files Changed	Coverage Δ
pkg/net/http/http.go	46.34% <0.00%> (-53.66%)	⬇️

... and 1 file with indirect coverage changes