Remove functionality for deleting inactive contacts

[rowanseymour]

which is now handled by RP/mailroom

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 53.20%. Comparing base (b78b579) to head (e7e15b9).

Files with missing lines	Patch %	Lines
indexers/base.go	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   54.66%   53.20%   -1.47%     
==========================================
  Files           6        6              
  Lines         439      421      -18     
==========================================
- Hits          240      224      -16     
+ Misses        174      172       -2     
  Partials       25       25              

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