Bump AGP to 9.0.1

[Falah-Zaidan]

Description

Changes to bump AGP to 9.0.1.

• Remove kotlin-android plugin (kgp)
• Amend DSL CommonExtension, TestExtension and LibraryExtension.
• Use .apply in build.gradle.kts logic
• Update kotlinter version to 5.5.0
• Run the formatKotlin command and disable ktlint_standard_kdoc rule
• Remove Incompatible report generation

extensions.configure(ComposeCompilerGradlePluginExtension::class.java) {
    reportsDestination.set(layout.buildDirectory.dir("compose_compiler"))
}

Testing notes/instructions:

• Build and run the sample, give it a quick smoke test.
• Run all tests locally.

[adi-gnm]

Rest of the changes look good, but do we need ksp here? I can't think of anything in this repo using it.

[Copilot]

Pull request overview

This PR updates the Android build configuration to support Android Gradle Plugin (AGP) 9.0.1, including related build-logic DSL adjustments and introducing the KSP plugin aliasing.

Changes:

• Bump AGP version to 9.0.1 and update build-logic DSL usage to match newer AGP APIs.
• Introduce the KSP plugin (via version catalog + module application).
• Remove the Kotlin Android plugin alias/application and remove Compose compiler report configuration.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
android/source/build.gradle.kts	Applies the KSP plugin to the :source module.
android/gradle/libs.versions.toml	Bumps AGP version; adds KSP version + plugin; removes Kotlin Android (kgp) + guardian kotlin plugin entries.
android/build.gradle.kts	Removes Kotlin Android (kgp) from root plugins; adds KSP plugin (apply false).
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/shared/BaseModuleConfig.kt	Updates CommonExtension typing and switches to .apply on defaultConfig.
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/shared/AndroidTestsConfig.kt	Updates CommonExtension typing; refactors managed devices DSL; adds (internal) with import.
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/shared/AndroidCompose.kt	Updates CommonExtension typing; switches to .apply for buildFeatures; removes compose compiler report config.
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/ComposeLibraryConventionPlugin.kt	Updates LibraryExtension import to the new AGP DSL package.
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/AndroidTestConventionPlugin.kt	Updates TestExtension import; removes Kotlin Android (kgp) application.
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/AndroidLibraryConventionPlugin.kt	Updates LibraryExtension import; removes Kotlin Android (kgp) application.
android/build-logic/convention/src/main/kotlin/com/theguardian/convention/AndroidApplicationConventionPlugin.kt	Removes Kotlin Android (kgp) application.

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[adi-gnm]

Hey, could we do the ktlint related changes here too?