Remove useless JS operation for relative time tooltips (#20756)

This operation that shifts the content from title to data-content is
useless when we can directly render the expected HTML instead.

This change does prevent these tooltips from working when the user has
JS disabled in their browser, but I think we made it clear by now that
JS is required for gitea to work properly.

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

web_src/js/features/common-global.js

@@ -70,14 +70,6 @@ export function initGlobalTooltips() {
 }
 
 export function initGlobalCommon() {
-  // Show exact time
-  $('.time-since').each(function () {
-    $(this)
-      .addClass('tooltip')
-      .attr('data-content', $(this).attr('title'))
-      .attr('title', '');
-  });
-
   // Undo Safari emoji glitch fix at high enough zoom levels
   if (navigator.userAgent.match('Safari')) {
     $(window).resize(() => {