[JP Install Full Plugin] Enable feature flag and update release notes

[RenanLukas]

Fixes #17837

To test:

• Install app and select site with only individual plugins;
• Open home screen: the JP full plugin install card should be shown.

Regression Notes

1. Potential unintended areas of impact
   None.

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

3. What automated tests I added (or what prevented me from doing so)
   Feature config files are currently not testable.

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-pr17983-cc0dcd7.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	cc0dcd7

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-pr17983-cc0dcd7.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	cc0dcd7

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

[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

[develric]

LGTM @RenanLukas , built the JP vanilla debug and checked for the feature to be active. Also did some smoke testing of the feature and looks good 👍 !