Add Yandex OAuth2 provider (#8335)

[anatolym]

Fix #8335

[codecov-io]

Codecov Report

Merging #10564 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master   #10564      +/-   ##
==========================================
- Coverage   43.72%   43.71%   -0.01%     
==========================================
  Files         585      585              
  Lines       82029    82034       +5     
==========================================
- Hits        35866    35864       -2     
- Misses      41723    41734      +11     
+ Partials     4440     4436       -4

Impacted Files	Coverage Δ
modules/lfs/server.go	44.6% <0%> (-0.55%)	⬇️
services/pull/check.go	50% <0%> (-3.66%)	⬇️
modules/process/manager.go	74.69% <0%> (-3.62%)	⬇️
modules/git/command.go	86.95% <0%> (-2.61%)	⬇️
services/pull/patch.go	61.93% <0%> (-2.59%)	⬇️
services/pull/temp_repo.go	29.05% <0%> (-2.57%)	⬇️
models/unit.go	37.03% <0%> (-2.47%)	⬇️
models/notification.go	63.88% <0%> (-0.84%)	⬇️
routers/repo/view.go	36.14% <0%> (-0.68%)	⬇️
... and 8 more

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[anatolym]

Looks like some stuff keeps failing. Is it something I should address?

[techknowlogick]

Seems when I resolved conflicts I didn't do it in a way that was go fmt capable, could you run make fmt?

[lafriks]

Looks good now