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/components/DiffFileTree.vue

@@ -30,7 +30,7 @@ export default {
           let newParent = {
             name: split,
             children: [],
-            isFile
+            isFile,
           };
 
           if (isFile === true) {
@@ -40,7 +40,7 @@ export default {
           if (parent) {
             // check if the folder already exists
             const existingFolder = parent.children.find(
-              (x) => x.name === split
+              (x) => x.name === split,
             );
             if (existingFolder) {
               newParent = existingFolder;
@@ -74,7 +74,7 @@ export default {
       // reduce the depth of our tree.
       mergeChildIfOnlyOneDir(result);
       return result;
-    }
+    },
   },
   mounted() {
     // Default to true if unset