Move user functions into user.go

[lunny]

As title.

[zeripath]

Hmm... Why not make this notice_model instead?

[lunny]

Hmm... Why not make this notice_model instead?

Then we just have two files in this sub model? It's too small so that we may have too many sub packages in models. I name it admin_model so that more models files could be moved in future.

[codecov-commenter]

Codecov Report

Merging #17659 (03f1311) into main (8fdc524) will increase coverage by 0.11%.
The diff coverage is 53.30%.

@@            Coverage Diff             @@
##             main   #17659      +/-   ##
==========================================
+ Coverage   45.35%   45.47%   +0.11%     
==========================================
  Files         799      800       +1     
  Lines       89062    89228     +166     
==========================================
+ Hits        40393    40574     +181     
+ Misses      42163    42121      -42     
- Partials     6506     6533      +27     

Impacted Files	Coverage Δ
cmd/admin.go	0.00% <0.00%> (ø)
cmd/doctor.go	0.00% <ø> (ø)
cmd/hook.go	7.79% <ø> (+0.01%)	⬆️
cmd/mailer.go	0.00% <ø> (ø)
cmd/web.go	0.00% <ø> (ø)
models/consistency.go	8.84% <0.00%> (ø)
models/db/engine.go	32.00% <ø> (ø)
models/error.go	38.81% <ø> (+0.33%)	⬆️
models/issue_list.go	71.80% <ø> (ø)
models/repo_indexer.go	53.22% <ø> (ø)
... and 77 more

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