Prepare 0.8.1 release

Gradle plugin: Adapt testRootSourceSetRegex to AGP9 for Android app

Gradle plugin: Adapt testRootSourceSetRegex to AGP9 for Android app

Gradle plugin: Adapt testRootSourceSetRegex to AGP9 for Android app

CI: Add workaround to upgrade JS package lock files

Backport from 0.8.0-K2.2.0 to 0.8.0-K2.1.20

Backport from 0.8.0-K2.1.20 to 0.8.0-K2.1.0

CI: Add workaround to upgrade JS package lock files

Update kotlin-js-store

Backport from 0.8.0-K2.3.20-Beta1 to 0.8.0-K2.3.0