Migration for deleting orphaned dependencies

[guillep2k]

Migration for getting rid of old records; related to #10608

[codecov-io]

Codecov Report

Merging #10617 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master   #10617      +/-   ##
==========================================
- Coverage   43.67%   43.62%   -0.05%     
==========================================
  Files         586      587       +1     
  Lines       82167    82174       +7     
==========================================
- Hits        35887    35851      -36     
- Misses      41828    41879      +51     
+ Partials     4452     4444       -8

Impacted Files	Coverage Δ
models/migrations/migrations.go	4.16% <ø> (ø)	⬆️
models/migrations/v129.go	0% <0%> (ø)
services/pull/check.go	32.92% <0%> (-17.08%)	⬇️
modules/git/utils.go	65.67% <0%> (-4.48%)	⬇️
models/unit.go	37.03% <0%> (-2.47%)	⬇️
services/pull/pull.go	34.7% <0%> (-1.18%)	⬇️
modules/git/repo.go	46.78% <0%> (-0.92%)	⬇️
routers/repo/view.go	36.14% <0%> (-0.68%)	⬇️
models/pull.go	42.77% <0%> (-0.57%)	⬇️
modules/indexer/stats/db.go	50% <0%> (ø)	⬆️
... and 4 more

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