fix(server): use correct file extension for motion photo videos (#8659)

* fix(server): use mp4 file extension for motion photo videos in archive download

* always use mp4 for videos

* get file extension from originalPath

* remove console log

* store motion assets with mp4 extension

* add migration

* set originalFileName for live photo asset stubs

* leave down migration empty

* only set originalFileName for livePhotoStillAsset

* use separate stub

* shorter stub name

server/src/migrations/1715435221124-MotionAssetExtensionMP4.ts

@@ -0,0 +1,11 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+export class MotionAssetExtensionMP41715435221124 implements MigrationInterface {
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `UPDATE "assets" SET "originalFileName" = regexp_replace("originalFileName", '\\.[a-zA-Z0-9]+$', '.mp4') WHERE "originalPath" LIKE '%.mp4' AND "isVisible" = false`,
+    );
+  }
+
+  public async down(): Promise<void> {}
+}