[Refactor] Move APIFormat functions into convert package (#12856)

* USER APIFormat -> ToUser

* Migrate more and mark APIFormat deprecated

* models.Comment APIFormat() -> convert.ToComment

* models.Release APIFormat() -> convert.ToRelease

* models.Attachments APIFormat() -> convert.ToReleaseAttachments

* models.CommitStatus APIFormat() -> convert.ToCommitStatus

* finish migration to convert.ToUser

* Move Test

* Imprufe Test

* fix test

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

models/userlist.go

@@ -8,7 +8,6 @@ import (
 	"fmt"
 
 	"code.gitea.io/gitea/modules/log"
-	api "code.gitea.io/gitea/modules/structs"
 )
 
 //UserList is a list of user.
@@ -94,12 +93,3 @@ func (users UserList) loadTwoFactorStatus(e Engine) (map[int64]*TwoFactor, error
 	}
 	return tokenMaps, nil
 }
-
-//APIFormat return list of users in api format
-func (users UserList) APIFormat() []*api.User {
-	result := make([]*api.User, 0, len(users))
-	for _, u := range users {
-		result = append(result, u.APIFormat())
-	}
-	return result
-}