feat: if trigger peer is seed peer, set NeedBackToSource flag true

[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

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (acdbc4b) 51.03% compared to head (94df815) 51.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2972      +/-   ##
==========================================
- Coverage   51.03%   51.02%   -0.01%     
==========================================
  Files         161      161              
  Lines       21865    21867       +2     
==========================================
- Hits        11158    11157       -1     
- Misses      10045    10046       +1     
- Partials      662      664       +2     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	51.02% <76.92%> (-0.01%)	⬇️

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

Files	Coverage Δ
scheduler/service/service_v2.go	84.82% <76.92%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes

[yxxhero]

@gaius-qi e2e tests didn't pass.