fix: Add stricter validation around image file type uploads (#3324)

* fix: Add stricter validation around image file type uploads

* revert backend restrictions, we want to allow unsupported images as file attachments

shared/utils/files.ts

@@ -19,3 +19,21 @@ export const bytesToHumanReadable = (bytes: number) => {
     "  kMGTPEZY"[out.length]
   }B`;
 };
+
+/**
+ * An array of image mimetypes commonly supported by modern browsers
+ */
+export const supportedImageMimeTypes = [
+  "image/jpg",
+  "image/jpeg",
+  "image/pjpeg",
+  "image/png",
+  "image/apng",
+  "image/avif",
+  "image/gif",
+  "image/webp",
+  "image/svg",
+  "image/svg+xml",
+  "image/bmp",
+  "image/tiff",
+];