Add Created & Updated to Milestone

[6543]

close #12655

[6543]

@a1012112796 this would be a lot of extra SQL querys on each milestone related thing ...

[a1012112796]

Suggest show it on ui also.

[6543]

@a1012112796 I think it will get to overloaded with this:

[codecov-commenter]

Codecov Report

Merging #12662 into master will decrease coverage by 0.04%.
The diff coverage is 53.01%.

@@            Coverage Diff             @@
##           master   #12662      +/-   ##
==========================================
- Coverage   43.40%   43.36%   -0.05%     
==========================================
  Files         647      648       +1     
  Lines       71500    71534      +34     
==========================================
- Hits        31038    31022      -16     
- Misses      35443    35480      +37     
- Partials     5019     5032      +13     

Impacted Files	Coverage Δ
models/migrations/migrations.go	4.66% <ø> (ø)
models/migrations/v149.go	0.00% <0.00%> (ø)
modules/git/repo_attribute.go	0.00% <0.00%> (ø)
modules/git/repo_tag.go	61.68% <ø> (-0.25%)	⬇️
modules/git/repo_tree.go	40.00% <0.00%> (ø)
routers/admin/admin.go	11.45% <0.00%> (-0.04%)	⬇️
routers/repo/lfs.go	0.00% <0.00%> (ø)
services/mirror/mirror.go	18.58% <0.00%> (ø)
modules/git/git.go	40.00% <50.00%> (+2.33%)	⬆️
modules/setting/setting.go	46.81% <50.00%> (ø)
... and 23 more

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[a1012112796]

👍