Refactor Media Manager sync logic and fix duplication bugs

This major refactor addresses improper image matching and duplication:

- Implemented strict ID-based matching in 'MediaService', removing the greedy filename matching fallback.

- Redesigned synchronization pipeline to treat Google Drive as the Source of Truth, supporting orphan adoption (Shopify -> Drive) and secure uploads.

- Implemented 'gallery_order' using Drive file properties (supporting both v2 and v3 APIs) for stable, drag-and-drop global ordering.

- Added conditional file renaming using timestamps to enforce '_' naming convention without unnecessary renames.

- Fixed runtime errors in 'MediaService' loops and updated 'ShopifyMediaService' GraphQL mutations to match correctly schema.

- Rewrote 'MediaService.test.ts' with robust test cases for strict matching, adoption, sorting, and reordering.

src/interfaces/IDriveService.ts

@@ -7,4 +7,5 @@ export interface IDriveService {
   trashFile(fileId: string): void
   updateFileProperties(fileId: string, properties: {[key: string]: string}): void
   createFile(blob: GoogleAppsScript.Base.Blob): GoogleAppsScript.Drive.File
+  getFileProperties(fileId: string): {[key: string]: string}
 }