Enforce trailing comma in JS on multiline (#30002)

To keep blame info accurate and to avoid [changes like
this](https://github.com/go-gitea/gitea/pull/29977/files#diff-c3422631a14edbe1e508c4b22f0c718db318be08a6e889427802f9b6165d88d6R359),
it's good to always have a trailing comma, so let's enforce it in JS.

This rule is completely automatically fixable with `make lint-js-fix`
and that's what I did here.

(cherry picked from commit 3d751b6ec18e57698ce86b79866031d2c80c2071)

Conflicts:
	web_src/js/components/DashboardRepoList.vue
	trivial context conflict because of '3b7b899afa fix commit_status'

web_src/js/utils/dom.js

@@ -191,7 +191,7 @@ export function autosize(textarea, {viewportMarginBottom = 0} = {}) {
       textarea.removeEventListener('mousemove', onUserResize);
       textarea.removeEventListener('input', resizeToFit);
       textarea.form?.removeEventListener('reset', onFormReset);
-    }
+    },
   };
 }