chore: collect agent logs for e2e tests

[zhiying-lin]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

https://github.com/Azure/fleet-networking/actions/runs/16486992184
please check the e2e workflow

Special notes for your reviewer

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (667c5c5) to head (6cde221).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #323      +/-   ##
==========================================
- Coverage   78.82%   78.56%   -0.26%     
==========================================
  Files          29       29              
  Lines        4246     4246              
==========================================
- Hits         3347     3336      -11     
- Misses        716      726      +10     
- Partials      183      184       +1     

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