* Fix#9189 - API Allow only specific Colums to be updated on Issue (#9539)
* dont insert "-1" in any case to issue.poster_id
* Make sure API cant override importand fields
* code format
* add Test for IssueEdit
* load milestone and return it on IssueEdit via API
* extend Test for TestAPIEditIssue
* fix TEST
* make sure Poster is loaded
* keep code format on backport as it is
* Fix bug when migrate from API (#8631)
* fix bug when migrate from API
* fix test
* fix test
* improve
* fix error message
* Update routers/api/v1/repo/repo.go
* remove unrelated
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>