[Build] Ubuntu: disable snap refresh during AMI build to prevent back…

[gmarciani]

…ground updates.

This is to prevent side effects, such as reboot failure caused by background update onf SSM agent.

Description of changes

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Tests

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References

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Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.18%. Comparing base (7f28a4b) to head (10cf341).
⚠️ Report is 7 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7152      +/-   ##
===========================================
+ Coverage    90.16%   90.18%   +0.01%     
===========================================
  Files          183      183              
  Lines        16541    16565      +24     
===========================================
+ Hits         14915    14939      +24     
  Misses        1626     1626              

Flag	Coverage Δ
unittests	90.18% <ø> (+0.01%)	⬆️

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[gmarciani]

Close in favor of #7159