[Prompts] Fix response list paging regression

[thomashorta]

Fixes #19728

The correct code was already in production until the release of 23.7, when it was removed because of an old PR (created before the correct code fix was merged in the past) that was rebased and I didn't realize it reverted to the wrong behavior.

PR that introduced the regression: #18340

This PR basically reintroduces the fix made by #18276 that was reverted by the culprit PR above:

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To Test:

1. Install and log into the Jetpack app
2. Make sure the dailyprompt-XXXX tag for the current day IS NOT FOLLOWED
3. Go to the dashboard
4. Tap View all responses on the Prompts card
5. Scroll the prompt tag responses list for a while
6. Verify pagination is working properly (posts are not shifting around, just being added at the end)
7. Verify posts keep loading when reaching the end of the feed as long as there are posts available

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Regression Notes

1. Potential unintended areas of impact

   • N/A

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

   • N/A

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

   • Update relevant unit test.

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PR Submission Checklist:

• I have completed the Regression Notes.
• 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.

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UI Changes Testing Checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• 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)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

Generated by 🚫 dangerJS

[wpmobilebot]

	1 Warning
⚠️	This PR is assigned to the milestone 23.8 ❄️. The due date for this milestone has already passed. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

Generated by 🚫 Danger

[wpmobilebot]

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

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr19730-90f8b07
	Commit	90f8b07
	Direct Download	jetpack-prototype-build-pr19730-90f8b07.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

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

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr19730-90f8b07
	Commit	90f8b07
	Direct Download	wordpress-prototype-build-pr19730-90f8b07.apk

Note: Google Login is not supported on these builds.

[RenanLukas]

Thanks for the PR. It's working as expected