Upgrade Kotlin to v2.0 (#3594)

* Bump Kotlin to v2.0

* Fix lots of issues due to the upgrade: lint issues, function signature incompatibilities, broken tests, etc.

---------

Co-authored-by: Benoit Marty <benoit@matrix.org>

features/ftue/test/build.gradle.kts

@@ -1,3 +1,5 @@
+import extension.setupAnvil
+
 /*
  * Copyright 2024 New Vector Ltd.
  *
@@ -7,7 +9,6 @@
 
 plugins {
     id("io.element.android-compose-library")
-    alias(libs.plugins.anvil)
     id("kotlin-parcelize")
 }
 
@@ -15,6 +16,8 @@ android {
     namespace = "io.element.android.features.ftue.test"
 }
 
+setupAnvil()
+
 dependencies {
     implementation(projects.features.ftue.api)
     implementation(projects.tests.testutils)