Add login name and source id for admin user searching API (#23376)

As title.

---------

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

models/user/search.go

@@ -22,6 +22,8 @@ type SearchUserOptions struct {
 	Keyword       string
 	Type          UserType
 	UID           int64
+	LoginName     string // this option should be used only for admin user
+	SourceID      int64  // this option should be used only for admin user
 	OrderBy       db.SearchOrderBy
 	Visible       []structs.VisibleType
 	Actor         *User // The user doing the search
@@ -62,6 +64,13 @@ func (opts *SearchUserOptions) toSearchQueryBase() *xorm.Session {
 		cond = cond.And(builder.Eq{"id": opts.UID})
 	}
 
+	if opts.SourceID > 0 {
+		cond = cond.And(builder.Eq{"login_source": opts.SourceID})
+	}
+	if opts.LoginName != "" {
+		cond = cond.And(builder.Eq{"login_name": opts.LoginName})
+	}
+
 	if !opts.IsActive.IsNone() {
 		cond = cond.And(builder.Eq{"is_active": opts.IsActive.IsTrue()})
 	}