Revert #7898

[guillep2k]

This PR reverts #7898 as it seems to produce more problems than it solves.

Fixes #8302
Fixes #8301 indirectly, by not using INSERT WHERE from xorm

[codecov-io]

Codecov Report

Merging #8304 into master will increase coverage by 0.01%.
The diff coverage is 51.42%.

@@            Coverage Diff             @@
##           master    #8304      +/-   ##
==========================================
+ Coverage   41.52%   41.53%   +0.01%     
==========================================
  Files         494      494              
  Lines       65384    65404      +20     
==========================================
+ Hits        27151    27166      +15     
- Misses      34737    34738       +1     
- Partials     3496     3500       +4

Impacted Files	Coverage Δ
routers/api/v1/repo/pull.go	37.01% <33.33%> (-0.04%)	⬇️
routers/repo/pull.go	30.22% <33.33%> (+0.02%)	⬆️
models/issue.go	50.66% <60.86%> (-0.01%)	⬇️
models/repo_indexer.go	66.27% <0%> (-1.94%)	⬇️
models/gpg_key.go	56.66% <0%> (+0.83%)	⬆️
routers/repo/view.go	43.54% <0%> (+1.01%)	⬆️
modules/process/manager.go	81.15% <0%> (+4.34%)	⬆️
models/unit.go	67.56% <0%> (+5.4%)	⬆️

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[guillep2k]

Reopens #7887

[guillep2k]

I'm closing this because #8309 corrected #8301; I'll improve #8307 ASAP.