Fix date rendering by adding <gitea-absolute-date> (#29725)

Alternative to: https://github.com/go-gitea/gitea/pull/29698
Fixes: https://github.com/go-gitea/gitea/issues/29034

<img width="278" alt="image"
src="12ecd967-2723-410d-8a28-a1b0f41b7bba">

It also fixes a secondary issue that we were showing timestamp tooltips
over date, which makes no sense, so these are now gone as well:

<img width="284" alt="image"
src="a70432f3-97b6-41e6-b202-b53b76924a66">

web_src/js/webcomponents/webcomponents.js

@@ -3,3 +3,4 @@ import './polyfill.js';
 
 import '@github/relative-time-element';
 import './GiteaOriginUrl.js';
+import './GiteaAbsoluteDate.js';