Change k9mail app to use build plugin

app/k9mail/build.gradle

@@ -1,6 +1,5 @@
 plugins {
-    alias(libs.plugins.android.application)
-    alias(libs.plugins.kotlin.android)
+    id("thunderbird.app.android.default")
 }
 
 if (rootProject.testCoverage) {
@@ -8,8 +7,6 @@ if (rootProject.testCoverage) {
 }
 
 dependencies {
-    coreLibraryDesugaring libs.desugar
-
     implementation project(":app:ui:legacy")
     implementation project(":app:ui:message-list-widget")
     implementation project(":app:core")
@@ -38,10 +35,6 @@ dependencies {
     testImplementation project(':plugins:openpgp-api-lib:openpgp-api')
 
     testImplementation libs.robolectric
-    testImplementation libs.junit
-    testImplementation libs.truth
-    testImplementation libs.mockito.inline
-    testImplementation libs.mockito.kotlin
     testImplementation libs.koin.test
     testImplementation libs.koin.test.junit4
 }
@@ -63,18 +56,10 @@ android {
                 "fy"
     }
 
-    buildFeatures {
-        buildConfig true
-    }
-
     signingConfigs {
         release
     }
 
-    compileOptions {
-        coreLibraryDesugaringEnabled true
-    }
-
     buildTypes {
         release {
             if (project.hasProperty('storeFile')) {
@@ -109,10 +94,6 @@ android {
         }
     }
 
-    lint {
-        checkDependencies true
-    }
-
     packagingOptions {
         jniLibs {
             excludes += ['kotlin/**']
@@ -136,11 +117,6 @@ android {
             ]
         }
     }
-
-    dependenciesInfo {
-        includeInApk = false
-        includeInBundle = false
-    }
 }
 
 if (project.hasProperty('keyAlias')) {

build.gradle.kts

@@ -1,5 +1,5 @@
 import com.android.build.gradle.BaseExtension
-import com.android.build.gradle.BasePlugin
+import com.android.build.gradle.LibraryPlugin
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 @Suppress("DSL_SCOPE_VIOLATION")
@@ -64,7 +64,7 @@ allprojects {
         }
     }
 
-    plugins.withType<BasePlugin> {
+    plugins.withType<LibraryPlugin> {
         configure<BaseExtension> {
             compileSdkVersion(33)