Fix remove file on initial comment (#20127) (#20128)

Backport #20127

Store the file uuid(which is returned by Gitea in the upload file response) onto the file object, so it can be used for the remove feature to specify this file.

Fix #20115

web_src/js/features/common-global.js

@@ -192,7 +192,8 @@ export function initGlobalDropzone() {
       thumbnailWidth: 480,
       thumbnailHeight: 480,
       init() {
-        this.on('success', (_file, data) => {
+        this.on('success', (file, data) => {
+          file.uuid = data.uuid;
           const input = $(`<input id="${data.uuid}" name="files" type="hidden">`).val(data.uuid);
           $dropzone.find('.files').append(input);
         });

web_src/js/features/repo-legacy.js

@@ -300,6 +300,7 @@ async function onEditContent(event) {
         thumbnailHeight: 480,
         init() {
           this.on('success', (file, data) => {
+            file.uuid = data.uuid;
             fileUuidDict[file.uuid] = {submitted: false};
             const input = $(`<input id="${data.uuid}" name="files" type="hidden">`).val(data.uuid);
             $dropzone.find('.files').append(input);