Remove awsapi leftovers

[winterhazel]

Description

This PR removes a few leftovers from awsapi.

Column default_zone_id was added to account solely for the integration, and is not used anymore. API markDefaultZoneForAccount was created to set the value of this unused column.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

How Has This Been Tested?

Tests are still pending.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.65%. Comparing base (4f11707) to head (1996013).

Additional details and impacted files

@@            Coverage Diff            @@
##               main   #13712   +/-   ##
=========================================
  Coverage     19.65%   19.65%           
+ Complexity    19792    19790    -2     
=========================================
  Files          6368     6367    -1     
  Lines        574881   574807   -74     
  Branches      70351    70345    -6     
=========================================
- Hits         112970   112957   -13     
+ Misses       449639   449578   -61     
  Partials      12272    12272           

Flag	Coverage Δ
uitests	3.41% <ø> (ø)
unittests	20.92% <ø> (+<0.01%)	⬆️

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