Remove support for publishing ads via data-transfer/graphsync

[gammazero]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 58 lines in your changes are missing coverage. Please review.

Comparison is base (9e4358c) 50.32% compared to head (be4fe6d) 49.80%.

Files	Patch %	Lines
engine/datastore.go	31.25%	38 Missing and 6 partials ⚠️
engine/engine.go	55.00%	6 Missing and 3 partials ⚠️
engine/options.go	33.33%	4 Missing ⚠️
cmd/provider/init.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
- Coverage   50.32%   49.80%   -0.53%     
==========================================
  Files          61       62       +1     
  Lines        5053     5088      +35     
==========================================
- Hits         2543     2534       -9     
- Misses       2193     2231      +38     
- Partials      317      323       +6     

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