Delete indexer DB entries when (re)creating index

[ethantkoenig]

Previously, if you needed to recreate the repo indexer, you need to delete the indexer and manually clear the repo_indexer_status table in the DB. Now, you just need to delete the indexer.

[codecov-io]

Codecov Report

Merging #3385 into master will increase coverage by 0.03%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3385      +/-   ##
==========================================
+ Coverage   35.57%   35.61%   +0.03%     
==========================================
  Files         281      281              
  Lines       40571    40574       +3     
==========================================
+ Hits        14435    14452      +17     
+ Misses      23995    23984      -11     
+ Partials     2141     2138       -3

Impacted Files	Coverage Δ
models/repo_indexer.go	46.01% <0%> (+4.31%)	⬆️
modules/process/manager.go	81.15% <0%> (+4.34%)	⬆️
modules/indexer/indexer.go	77.5% <0%> (+7.5%)	⬆️

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