Fix/add provided package

[neolynx]

Fixes #1378

Description of the Change

Since ab18d48 list.Search() is also returning provided packages. This is not wanted in all scenarios, for example then adding packages to a repository or in a snapshot pull.

Checklist

• unit-test added (if change is algorithm)
• functional test added/updated (if change is functional)

[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 74.86%. Comparing base (7436454) to head (9d05949).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
api/snapshot.go	0.00%	1 Missing ⚠️
deb/package_collection.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1386   +/-   ##
=======================================
  Coverage   74.86%   74.86%           
=======================================
  Files         157      157           
  Lines       18088    18090    +2     
=======================================
+ Hits        13541    13543    +2     
  Misses       3450     3450           
  Partials     1097     1097           

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[5hir0kur0]

Looks good to me 👍🏼