Complete upgrade Dokka to V2 (#2914)

Closes #2912

build-logic/src/main/kotlin/ktlint-dokka.gradle.kts

@@ -1,20 +1,16 @@
 plugins {
     `java-library`
-    id("org.jetbrains.dokka")
+    // Generates Javadoc documentation
+    id("org.jetbrains.dokka-javadoc")
+}
+
+dokka {
+    dokkaPublications.javadoc {
+        outputDirectory.set(layout.buildDirectory.dir("javadoc"))
+    }
 }
 
 java {
     withSourcesJar()
     withJavadocJar()
 }
-
-tasks.dokkaJavadoc {
-    notCompatibleWithConfigurationCache("https://github.com/Kotlin/dokka/issues/1217")
-    outputDirectory = layout.buildDirectory.dir("javadoc")
-}
-
-tasks.named<Jar>("javadocJar") {
-    dependsOn(tasks.dokkaJavadoc)
-    archiveClassifier = "javadoc"
-    from(tasks.dokkaJavadoc)
-}

gradle.properties

@@ -23,3 +23,6 @@ org.gradle.caching=true
 # The release process of ktlint breaks whenever the configuration cache is enabled as not all gradle tasks fully supports this feature yet.
 # As the configuration cache only slightly improves the build performance, it is kept disabled for now.
 org.gradle.configuration-cache=false
+
+# Enable helpers for migration to Dokka V2
+org.jetbrains.dokka.experimental.gradle.pluginMode=V2EnabledWithHelpers