Disable overscroll animation on main plugins screen

[mkevins]

Fixes #14087

Description

This PR disables the overscroll animation on the main plugin screen. This is done because it seems that the animation may lead to the expectation that swiping down will refresh the contents of this screen. In fact, this screen does not have a multi-list refresh implemented, and each individual plugins list can be refreshed by tapping into the detail view.

To test:

1. Login to an account with an Atomic site (with plugins enabled)
2. Select that Atomic site from the My Sites list
3. Navigate to the main plugins screen (Menu tab -> Plugins)
4. Wait for the plugins screen to load
5. Swipe down
6. Expect that the overscroll animation is disabled

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)
   N/A

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.

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)

[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	pr18498-bf86ba1
	Commit	bf86ba1
	Direct Download	jetpack-prototype-build-pr18498-bf86ba1.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	pr18498-bf86ba1
	Commit	bf86ba1
	Direct Download	wordpress-prototype-build-pr18498-bf86ba1.apk

Note: Google Login is not supported on these builds.

[antonis]

Thank you for tackling this @mkevins 🙇
I agree with your reasoning on resolving this issue 👍
The code changes LGTM and the app behaves as expected 🎉

device-2023-05-24-112817.mp4

[mkevins]

Thank you for reviewing and testing this Antonis, and for considering the reasoning behind the choice of solution. ❤️