Fix large font size accessibility issue on migration screens by making the content scrollable

[ovitrif]

Fixes #17467

This PR fixes the accessibility issues on the WordPress to Jetpack Migration Flow UI namely:

• When the largest font size is set via Accessibility settings, on some devices part of the text might not be fitting on the screen.

It accomplishes this by making the content of the Notifications and Success screens scrollable.

🏁 All these changes are behind a temporary feature flag.

To test:

1️⃣ Test with largest font size

0. Open the Jetpack app & login
1. Go to Me → App Settings → Debug Settings
2. Enable the JetpackMigrationFlowFeatureConfig & restart the app
3. Toggle largest font size via accessibility settings
   a. Open the device Settings app, go to Accessibility → Display size and text
   b. Set Font size to the max
4. Return to / Open the Jetpack app
5. Tap Continue on the Welcome Step
6. Verify that the Notifications screen can be scrolled if the text is not fitting
7. Tap Continue on the Notifications step
8. Verify that the Success screen can be scrolled if the text is not fitting

2️⃣ Regression Testing - with default font size

1. Reset Accessibility font size settings
   a. Open the device Settings app, go to Accessibility → Display size and text
   b. Tap Reset settings at the bottom, or restore the initial font size
2. Open the Jetpack app
3. Tap Continue on the Welcome Step
4. Verify that Notifications screen matches the design (no regression)
5. Tap Continue on the Notifications step
6. Verify that the Success screen matches the design (no regression)

Preview

Note that I've also set Display Size to max via Accessibility Settings, otherwise the text would fit on one screen on the Pixel 6 Emulator.

largeTexts_preview.mp4

Regression Notes

1. Potential unintended areas of impact
   Migration screens behind the feature flag.

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

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.

[wpmobilebot]

📲 You can test these changes on Jetpack by downloading jetpack-installable-build-pr17474-f03af63.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	Jetpack
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	f03af63

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[wpmobilebot]

📲 You can test these changes on WordPress by downloading wordpress-installable-build-pr17474-f03af63.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	WordPress
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	f03af63

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[antonis]

Thank you for tackling this issue @ovitrif 🙇
The code looks good and the JP app behaves as expected with large font/screen sizes (tested on Pixel 5 w/ Android 13) 🎉