[Refactor] Move APIFormat functions into convert package

[6543]

Move APIIFormat convertion of:

• User
• Comment
• Release
• Attachments
• CommitStatus

to convert package

[6543]

blocked by #12729

[codecov-commenter]

Codecov Report

Merging #12856 into master will increase coverage by 0.01%.
The diff coverage is 79.05%.

@@            Coverage Diff             @@
##           master   #12856      +/-   ##
==========================================
+ Coverage   42.49%   42.51%   +0.01%     
==========================================
  Files         672      674       +2     
  Lines       73785    73780       -5     
==========================================
+ Hits        31353    31364      +11     
+ Misses      37361    37345      -16     
  Partials     5071     5071              

Impacted Files	Coverage Δ
models/attachment.go	58.51% <ø> (-2.60%)	⬇️
models/commit_status.go	62.06% <ø> (-3.34%)	⬇️
models/issue_comment.go	45.56% <ø> (+1.15%)	⬆️
models/release.go	52.17% <ø> (-5.29%)	⬇️
models/user.go	53.18% <ø> (-0.40%)	⬇️
models/userlist.go	90.38% <ø> (+7.92%)	⬆️
modules/convert/user.go	88.23% <0.00%> (-11.77%)	⬇️
routers/api/v1/repo/issue_subscription.go	30.26% <0.00%> (-1.25%)	⬇️
routers/api/v1/repo/release_attachment.go	0.00% <0.00%> (ø)
routers/repo/issue.go	36.86% <0.00%> (ø)
... and 24 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov-io]

Codecov Report

Merging #12856 into master will decrease coverage by 0.00%.
The diff coverage is 79.05%.

@@            Coverage Diff             @@
##           master   #12856      +/-   ##
==========================================
- Coverage   42.01%   42.01%   -0.01%     
==========================================
  Files         681      683       +2     
  Lines       75220    75215       -5     
==========================================
- Hits        31604    31599       -5     
  Misses      38451    38451              
  Partials     5165     5165              

Impacted Files	Coverage Δ
models/attachment.go	58.51% <ø> (-2.60%)	⬇️
models/commit_status.go	62.06% <ø> (-3.34%)	⬇️
models/issue_comment.go	52.21% <ø> (-0.72%)	⬇️
models/release.go	52.17% <ø> (-5.29%)	⬇️
models/user.go	54.17% <ø> (-0.41%)	⬇️
models/userlist.go	90.38% <ø> (+7.92%)	⬆️
modules/convert/user.go	88.23% <0.00%> (-11.77%)	⬇️
routers/api/v1/repo/issue_subscription.go	30.26% <0.00%> (-1.25%)	⬇️
routers/api/v1/repo/release_attachment.go	0.00% <0.00%> (ø)
routers/repo/issue.go	34.93% <0.00%> (ø)
... and 20 more

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 131278f...6c6891e. Read the comment docs.