Remove WPImageSource usages

[kean]

Remove WPImageSource usage from MediaExternalExporter, JetpackSocialNoConnectionView, and StatsTotalRow. The app now uses an improved ImageDownloader that has memory cache, HTTP disk cache, and supports background decompression – among other things.

To test:

MediaExternalExporter (External Images)

• Create a new Post
• Add "Image"
• Select "Free Photo Library" and pick an image
• Verify that the image got uploaded

JetpackSocialNoConnectionView

• Verify that Jetpack connection card images get downloaded

StatsTotalRow

• Verify that Stats / Referrer images get downloaded and displayed

Regression Notes

1. Potential unintended areas of impact: multiple
2. What I did to test those areas of impact (or what existing automated tests I relied on): manual
3. What automated tests I added (or what prevented me from doing so): n/a

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

UI Changes testing checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr22297-f898dec
	Version	23.9
	Bundle ID	org.wordpress.alpha
	Commit	f898dec
	App Center Build	WPiOS - One-Offs #8259

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr22297-f898dec
	Version	23.9
	Bundle ID	com.jetpack.alpha
	Commit	f898dec
	App Center Build	jetpack-installable-builds #7283

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.