Refactor UpdateOAuth2Application

[6543]

as title come up in #11008

[6543]

thx @techknowlogick

[codecov-io]

Codecov Report

Merging #11034 into master will increase coverage by 0.03%.
The diff coverage is 48.14%.

@@            Coverage Diff             @@
##           master   #11034      +/-   ##
==========================================
+ Coverage   43.42%   43.46%   +0.03%     
==========================================
  Files         600      600              
  Lines       85022    85026       +4     
==========================================
+ Hits        36922    36954      +32     
+ Misses      43541    43517      -24     
+ Partials     4559     4555       -4     

Impacted Files	Coverage Δ
routers/user/setting/oauth2.go	0.00% <0.00%> (ø)
models/oauth2_application.go	64.19% <47.82%> (-2.25%)	⬇️
routers/api/v1/user/app.go	68.24% <100.00%> (+0.63%)	⬆️
modules/indexer/stats/db.go	50.00% <0.00%> (-18.75%)	⬇️
modules/log/event.go	64.61% <0.00%> (-1.03%)	⬇️
models/issue.go	51.95% <0.00%> (+0.46%)	⬆️
modules/notification/webhook/webhook.go	40.20% <0.00%> (+0.58%)	⬆️
services/pull/pull.go	34.16% <0.00%> (+0.95%)	⬆️
modules/git/repo.go	51.88% <0.00%> (+1.25%)	⬆️
services/pull/temp_repo.go	34.18% <0.00%> (+2.56%)	⬆️
... and 4 more

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[6543]

this pull is failing now because of a strange merge behaviour - I'll rebase it

[zeripath]

make lg-tm work