Tooltip: Destroy $tip, $arrow, $viewport to avoid memory leak

Closes #16039.

js/tooltip.js

@@ -440,6 +440,12 @@
     clearTimeout(this.timeout)
     this.hide(function () {
       that.$element.off('.' + that.type).removeData('bs.' + that.type)
+      if (that.$tip) {
+        that.$tip.detach()
+      }
+      that.$tip = null
+      that.$arrow = null
+      that.$viewport = null
     })
   }