Deprecate file preview based on data uri

The file previww implementation could not work since the Content Security Policy has been improved deprecating the usage of data: uri and will need to be reimplemented on the base of the secure file viewer.

The benefits of such an implementation would consists in the possibility to implement preview for PDF and other types of files other than only images and to possibly show metadata to users / enable them to redact part of the file before of the upload.

client/app/css/main.css

@@ -360,16 +360,6 @@ legend {
   height: 12rem;
 }
 
-.imgPreview {
-  height: 10rem;
-  width: 10rem;
-}
-
-.imgPreview img {
-  height: 100%;
-  width: 100%;
-}
-
 .fileUpload {
   position: absolute;
   top: 0;

client/app/js/services.js

@@ -868,17 +868,6 @@ factory("Utils", ["$rootScope", "$http", "$q", "$location", "$filter", "$timeout
       return $location.path() === "/submission";
     },
 
-    showFilePreview: function(content_type) {
-      var content_types = [
-        "image/gif",
-        "image/jpeg",
-        "image/png",
-        "image/bmp"
-      ];
-
-      return content_types.indexOf(content_type) > -1;
-    },
-
     moveUp: function(elem) {
       elem[this.getYOrderProperty(elem)] -= 1;
     },

client/app/views/partials/wbfile_upload_status.html

@@ -5,9 +5,6 @@
         <div class="row">
           <div class="col-md-4">
             <div class="filePreview">
-              <div class="imgPreview">
-                <img alt="preview picture" data-flow-img="file" data-ng-if="Utils.showFilePreview(file.file.type)" />
-              </div>
               <div class="fileButtons">
                 <div data-ng-if="page === 'submissionpage' || !file.isComplete()" class="removeFileButton text-danger">
                   <div class="btn btn-sm btn-danger" data-ng-click="Utils.removeFile(submission, entry, uploads[fileinput].files, file)"><i class="fa-solid fa-times" aria-label="{'Remove' | translate}"></i></div>