Fix zero created time bug on commit api

[lunny]

Fix #17543

I haven't add LastLogin here because it's related some user privacy and I will left it other PRs.

[codecov-commenter]

Codecov Report

Merging #17546 (cc5b4f4) into main (cb9c818) will decrease coverage by 0.00%.
The diff coverage is 26.47%.

@@            Coverage Diff             @@
##             main   #17546      +/-   ##
==========================================
- Coverage   45.49%   45.49%   -0.01%     
==========================================
  Files         793      793              
  Lines       88766    88809      +43     
==========================================
+ Hits        40385    40404      +19     
- Misses      41868    41887      +19     
- Partials     6513     6518       +5     

Impacted Files	Coverage Δ
cmd/web.go	0.00% <0.00%> (ø)
cmd/web_letsencrypt.go	0.00% <0.00%> (ø)
models/login/session.go	3.03% <ø> (ø)
modules/templates/helper.go	51.02% <ø> (ø)
routers/web/user/auth.go	12.18% <0.00%> (ø)
services/auth/source/oauth2/store.go	0.00% <0.00%> (ø)
routers/web/repo/issue.go	38.68% <56.25%> (+0.09%)	⬆️
modules/convert/git_commit.go	87.90% <100.00%> (+0.19%)	⬆️
services/auth/source/oauth2/init.go	38.46% <100.00%> (+2.74%)	⬆️
modules/notification/mail/mail.go	35.29% <0.00%> (-2.95%)	⬇️
... and 9 more

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