Move PushUpdateAddDeleteTags to repository module from models

[lunny]

As title.

[guillep2k]

LGTM, possibly with a small improvement.

[codecov-io]

Codecov Report

Merging #10106 into master will decrease coverage by <.01%.
The diff coverage is 13.55%.

@@            Coverage Diff             @@
##           master   #10106      +/-   ##
==========================================
- Coverage    43.4%    43.4%   -0.01%     
==========================================
  Files         575      576       +1     
  Lines       79640    79632       -8     
==========================================
- Hits        34567    34562       -5     
  Misses      40792    40792              
+ Partials     4281     4278       -3

Impacted Files	Coverage Δ
models/helper_environment.go	90% <ø> (ø)	⬆️
routers/repo/repo.go	30.02% <0%> (ø)	⬆️
modules/repofiles/update.go	39.02% <0%> (ø)	⬆️
services/release/release.go	27.04% <0%> (ø)	⬆️
models/update.go	7.79% <100%> (+1.4%)	⬆️
models/release.go	57.52% <25%> (-0.95%)	⬇️
modules/repository/update.go	7.14% <7.14%> (ø)
models/user.go	49.24% <83.33%> (+0.08%)	⬆️
models/unit.go	37.03% <0%> (-2.47%)	⬇️
modules/queue/unique_queue_disk_channel.go	52.56% <0%> (-1.93%)	⬇️
... and 4 more

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[lunny]

@guillep2k done.