Log when ABM terms have changed without requiring debug logging

[mna]

#13012

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Changes file added for user-visible changes in changes/ or orbit/changes/.
  See Changes files for more information.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7067ca5) 58.87% compared to head (73e86d9) 58.86%.
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14712      +/-   ##
==========================================
- Coverage   58.87%   58.86%   -0.01%     
==========================================
  Files         924      924              
  Lines       77207    77207              
  Branches     2222     2222              
==========================================
- Hits        45452    45445       -7     
- Misses      28155    28160       +5     
- Partials     3600     3602       +2     

Flag	Coverage Δ
backend	59.56% <0.00%> (-0.01%)	⬇️

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Files	Coverage Δ
server/mdm/apple/apple_mdm.go	50.65% <0.00%> (ø)

... and 2 files with indirect coverage changes

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