fix: turn on the atm feature by default in member agent

[zhiying-lin]

What type of PR is this?
/kind bug

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

Special notes for your reviewer

[michaelawyu]

LGTM ;)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.52%. Comparing base (29d2d8a) to head (784cb05).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
+ Coverage   79.49%   79.52%   +0.02%     
==========================================
  Files          28       28              
  Lines        3936     3936              
==========================================
+ Hits         3129     3130       +1     
+ Misses        647      646       -1     
  Partials      160      160              

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