Fix various problems around projects board view (#30696) (#30902)

Backport #30696 by @lunny

# The problem
The previous implementation will start multiple POST requests from the
frontend when moving a column and another bug is moving the default
column will never be remembered in fact.

# What's changed

- [x] This PR will allow the default column to move to a non-first
position
- [x] And it also uses one request instead of multiple requests when
moving the columns
- [x] Use a star instead of a pin as the icon for setting the default
column action
- [x] Inserted new column will be append to the end
- [x] Fix #30701 the newly added issue will be append to the end of the
default column
- [x] Fix when deleting a column, all issues in it will be displayed
from UI but database records exist.
- [x] Add a limitation for columns in a project to 20. So the sorting
will not be overflow because it's int8.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/project/project.go

@@ -161,6 +161,13 @@ func (p *Project) IsRepositoryProject() bool {
 	return p.Type == TypeRepository
 }
 
+func (p *Project) CanBeAccessedByOwnerRepo(ownerID int64, repo *repo_model.Repository) bool {
+	if p.Type == TypeRepository {
+		return repo != nil && p.RepoID == repo.ID // if a project belongs to a repository, then its OwnerID is 0 and can be ignored
+	}
+	return p.OwnerID == ownerID && p.RepoID == 0
+}
+
 func init() {
 	db.RegisterModel(new(Project))
 }