[JENKINS-75892] Set the default enter delay for tooltips to 500 msec

Tooltips should not pop up immediately, rather they should use a small delay.
Otherwise, tooltips show up while the user still is moving the mouse.
I set the delay to 500 msec, which seems to be a reasonable setting for Jenkins' views.

Author: uhafner

src/main/js/components/tooltips/index.js

@@ -38,7 +38,8 @@ function registerTooltip(element) {
 
   const tooltip = element.getAttribute("tooltip");
   const htmlTooltip = element.getAttribute("data-html-tooltip");
-  const delay = element.getAttribute("data-tooltip-delay") || 0;
+  const defaultDelay = 500;
+  const delay = element.getAttribute("data-tooltip-delay") || defaultDelay;
   let appendTo = document.body;
   if (element.hasAttribute("data-tooltip-append-to-parent")) {
     appendTo = "parent";