[Android] Image block - upload multiple

[mkevins]

Related PRs

gutenberg: WordPress/gutenberg#24346
WordPress-Android: wordpress-mobile/WordPress-Android#12591

Description

This PR is a first step towards resolving the Android part of this issue: #2255

To test:

Test uploading multiple images from the image block:

1. Add an image block to a new post
2. Tap "ADD IMAGE"
3. Tap "Choose from device" (observe that multiple images can be selected)
4. Select a few images and tap "Insert"

Expected:

• All images should be inserted as separate image blocks
• Each image should show progress as it uploads
• After upload completes, HTML mode should show a remote URL for the image (i.e. not "file://...")

Test the media upload flows for the following blocks to ensure there are no regressions:

Image block

• Image block - Insert image from device (failing) - steps
• Image block - Insert image from device (cancel) - steps
• Image block - Close/Re-open post with an ongoing image upload - steps

Video block

• Video block - Insert video from device (failing) - steps
• Video block - Insert video from device (cancel) - steps
• Video block - Close/Re-open post with an ongoing video upload - steps

Media & Text block

• Media Text block - Insert image from device (failing) - steps
• Media Text block - Insert video from device (failing) - steps
• Media Text block - Insert image from device (cancel) - steps
• Media Text block - Insert video from device (cancel) - steps
• Media Text block - Close/Re-open post with an ongoing image upload - steps
• Media Text block - Close/Re-open post with an ongoing video upload - steps

Gallery block

• Gallery block - Choose from device (stay in editor) - Successful upload - steps
• Gallery block - Choose from device (stay in editor) - Failed upload - steps
• Gallery block - Close post with an ongoing image upload - steps
• Gallery block - Close/Re-open post with an ongoing image upload - steps
• Gallery block - Take a photo - steps
• Gallery block - Choose from the free photo library - steps

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[geriux]

LGTM! Tested all cases plus the new functionality. Nice work @mkevins!

[peril-wordpress-mobile]

Wanna run full suite of Android and iOS UI tests? Click here and 'Approve' CI job!

[mkevins]

Thanks for reviewing and testing Gerardo!