Duplicate media on upload after retry

Expected behavior

Retrying upload for a previously upload failed image should not result in duplicate images in the media library.

Actual behavior

If you upload more than one images at once and upload fails for an image, then on retrying to upload makes duplicate copies in the media library.

(Tested on a self-hosted site. Might also be reproducible on a simple WP site.)

Steps to reproduce the behavior

1. Launch app
2. Open a draft post in the Gutenberg Editor
3. Select image block
4. Select more than one images for upload
5. Enable airplane mode, wait for ~1 min and then disable it while images are uploading so that images upload fails for at least one of the image (I also re-surfaced the app from background once)
6. Click retry on the failed image
7. Wait for the upload to complete
8. Go to media library and notice duplicate copy of the failed image

Attempt 1: https://cloudup.com/izjkk0AITDc (Duplicate media on timestamp 1:14)

Attempt 2: https://cloudup.com/iydwecO-FxC (Duplicate media on timestamp 1:53)

Tested on [Pixel3 API 27], WPAndroid [16.2-rc-1]

Start by reproducing the multi-image upload flow in the Gutenberg Editor using the listed airplane-mode interruption, then trace the retry path for the failed image and its media-library result. Done means retrying a failed upload no longer creates a duplicate image.