feat: update export controller

[zhiying-lin]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:
added the util func to support atm feature

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

Special notes for your reviewer

The new func will be called in the next PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.47%. Comparing base (3174f3c) to head (85a3e63).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
+ Coverage   79.59%   80.47%   +0.88%     
==========================================
  Files          26       26              
  Lines        2455     2494      +39     
==========================================
+ Hits         1954     2007      +53     
+ Misses        364      354      -10     
+ Partials      137      133       -4     

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