Filter out ADS entries for duplicate bibcodes

[lpsinger]

Fixes #2639.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 6.21%. Comparing base (7321140) to head (3a1644e).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
app/scheduled/ads/index.ts	0.00%	12 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #2655      +/-   ##
========================================
- Coverage   6.22%   6.21%   -0.01%     
========================================
  Files        167     167              
  Lines       4225    4231       +6     
  Branches     467     467              
========================================
  Hits         263     263              
- Misses      3960    3966       +6     
  Partials       2       2              

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