Node-split: Add check if ATXv2 is live already for malsync

[fasmat]

Motivation

This ports #6715 to the node-split build

Description

No other changes

Test Plan

n/a

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

Attention: Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.1%. Comparing base (a21cfea) to head (d211d6f).
Report is 5 commits behind head on node-split-poc.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
syncer/malsync/syncer.go	91.6%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           node-split-poc   #6717   +/-   ##
==============================================
  Coverage            77.1%   77.1%           
==============================================
  Files                 387     389    +2     
  Lines               54129   54201   +72     
==============================================
+ Hits                41744   41843   +99     
+ Misses               9889    9865   -24     
+ Partials             2496    2493    -3     

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