Stats Insights: Optimize table view updates by integrating diffable data source

[staskus]

Use a diffable data source within Stats Insights and Stats Insights Details to make table view cell reloads more efficient. More information about implementation in: #22542

Related diff: wordpress-mobile/WordPressKit-iOS#751

To test:

1. Open Stats Insights
2. Confirm data loads correctly without flickering
3. Tap on Insights management button on top right
4. Remove all cards
5. Confirm empty view with a button is shown
6. Add all cards
7. Tap "View More" on all the cards
8. Confirm Stats Insights Details view opens

Regression Notes

1. Potential unintended areas of impact

Breaking loading of data within existing Stats Insights and Stats Insights Details.

2. What I did to test those areas of impact (or what existing automated tests I relied on)

• Manual testing
• SiteStatsInsightsViewModelTests should still succeed

9. What automated tests I added (or what prevented me from doing so)

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.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• 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)

[dangermattic]

	1 Warning
⚠️	This PR is larger than 500 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

Generated by 🚫 Danger

[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	pr22592-3c87ba7
	Version	24.6
	Bundle ID	com.jetpack.alpha
	Commit	3c87ba7
	App Center Build	jetpack-installable-builds #8456

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 WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr22592-3c87ba7
	Version	24.6
	Bundle ID	org.wordpress.alpha
	Commit	3c87ba7
	App Center Build	WPiOS - One-Offs #9413

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

[peril-wordpress-mobile]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

Generated by 🚫 dangerJS

[staskus]

@guarani review for this can wait after we're done with Traffic tab.

[staskus]

I added Stats Insights Details support in this PR.
Stats Period Details is implemented in #22823.

These two PRs should cover diffable data source support for all the Stats.

[guarani]

Related to the failing CI checks: https://a8c.slack.com/archives/C05N140C8H5/p1710357494940709

[guarani]

I moved this to a new GitHub project, more context here: p1710464002701159-slack-C06BR07TJHK

[staskus]

TODO: Requires the same fix #22857

Done:

[guarani]

I tested this and can see the improvement!
The changes themselves were hard to review due to the number of lines updated, so I skimmed the changes and relied on testing.