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'

tools/generate-images.js

@@ -20,7 +20,7 @@ async function generate(svg, path, {size, bg}) {
         'removeDimensions',
         {
           name: 'addAttributesToSVGElement',
-          params: {attributes: [{width: size}, {height: size}]}
+          params: {attributes: [{width: size}, {height: size}]},
         },
       ],
     });

tools/generate-svg.js

@@ -39,8 +39,8 @@ async function processFile(file, {prefix, fullName} = {}) {
           attributes: [
             {'xmlns': 'http://www.w3.org/2000/svg'},
             {'width': '16'}, {'height': '16'}, {'aria-hidden': 'true'},
-          ]
-        }
+          ],
+        },
       },
     ],
   });