Refactor issue filter (labels, poster, assignee) (#32771)

Rewrite a lot of legacy strange code, remove duplicate code, remove
jquery, and make these filters reusable.

Let's forget the old code, new code affects: 

* issue list open/close switch
* issue list filter (label, author, assignee)
* milestone list open/close switch
* milestone issue list filter (label, author, assignee)
* project view (label, assignee)

routers/web/org/projects.go

@@ -339,12 +339,7 @@ func ViewProject(ctx *context.Context) {
 	// 0 means issues with no label
 	// blank means labels will not be filtered for issues
 	selectLabels := ctx.FormString("labels")
-	if selectLabels == "" {
-		ctx.Data["AllLabels"] = true
-	} else if selectLabels == "0" {
-		ctx.Data["NoLabel"] = true
-	}
-	if len(selectLabels) > 0 {
+	if selectLabels != "" {
 		labelIDs, err = base.StringsToInt64s(strings.Split(selectLabels, ","))
 		if err != nil {
 			ctx.Flash.Error(ctx.Tr("invalid_data", selectLabels), true)