Make time tooltips interactive (#23526) (#23527)

Backport #23526 by @silverwind

Fixes https://codeberg.org/forgejo/forgejo/issues/511

<img width="379" alt="Screenshot 2023-03-16 at 20 23 10"
src="https://user-images.githubusercontent.com/115237/225731294-4c6e4f44-bdcc-4c8c-86e2-49f7c03b377d.png">

Co-authored-by: silverwind <me@silverwind.io>

web_src/js/modules/tippy.js

@@ -33,6 +33,7 @@ export function initTooltip(el, props = {}) {
     content,
     delay: 100,
     role: 'tooltip',
+    ...(el.getAttribute('data-tooltip-interactive') === 'true' ? {interactive: true} : {}),
     ...props,
   });
 }