Refactor static checks configuration for Kotlin DSL

Moved static check configurations (Checkstyle and PMD) from the `staticChecks.gradle` script into `build.gradle.kts`. This centralizes Gradle setup into one file and leverages Kotlin DSL for better type safety and maintainability.

Author: VitaliyBoyko

build.gradle.kts

@@ -3,12 +3,15 @@
  * See COPYING.txt for license details.
  */
 
+import groovy.json.JsonSlurper
 import org.jetbrains.changelog.Changelog
 import org.jetbrains.changelog.markdownToHTML
 import org.jetbrains.intellij.platform.gradle.TestFrameworkType
 
 plugins {
     id("java")
+    id("checkstyle")
+    id("pmd")
     alias(libs.plugins.kotlin)
     alias(libs.plugins.intelliJPlatform)
     alias(libs.plugins.changelog)
@@ -109,10 +112,6 @@ intellijPlatform {
     }
 }
 
-apply {
-    from("${project.rootDir}/gradle-tasks/staticChecks.gradle")
-}
-
 changelog {
     groups.empty()
     repositoryUrl = providers.gradleProperty("pluginRepositoryUrl")
@@ -141,6 +140,20 @@ tasks {
         exclude("com/magento/idea/magento2plugin/actions/**") //https://github.com/magento/magento2-phpstorm-plugin/issues/2474
         useJUnitPlatform()
     }
+
+    checkstyle {
+        toolVersion = "8.31"
+        isIgnoreFailures = false
+        maxWarnings = 0
+        configFile = rootProject.file("${rootDir}/gradle-tasks/checkstyle/checkstyle.xml")
+    }
+
+    pmd {
+        toolVersion = "6.21.0"
+        isConsoleOutput = true
+        ruleSetFiles = files("${rootDir}/gradle-tasks/pmd/ruleset.xml")
+        ruleSets = listOf()
+    }
 }
 
 intellijPlatformTesting {
@@ -163,3 +176,66 @@ intellijPlatformTesting {
         }
     }
 }
+
+// Configure Checkstyle tasks
+tasks.withType(Checkstyle::class).configureEach {
+    // Specify all files that should be checked
+    classpath = files()
+    setSource("${project.rootDir}")
+}
+
+// Execute Checkstyle on all files
+tasks.register<Checkstyle>("checkstyle") {
+    // Task-specific configuration can go here if necessary
+}
+
+// Execute Checkstyle on all modified files
+tasks.register<Checkstyle>("checkstyleCI") {
+    val changedFiles = getChangedFiles()
+    include(changedFiles)
+}
+
+// Configure PMD tasks
+tasks.withType(Pmd::class).configureEach {
+    // Specify all files that should be checked
+    classpath = files()
+    setSource("${project.rootDir}")
+}
+
+// Execute PMD on all files
+tasks.register<Pmd>("pmd") {
+    // Task-specific configuration can go here if necessary
+}
+
+// Execute PMD on all modified files
+tasks.register<Pmd>("pmdCI") {
+    val changedFiles = getChangedFiles()
+    include(changedFiles)
+}
+
+/**
+ * Get all files that are changed but not deleted nor renamed.
+ * Compares to master or the specified target branch.
+ *
+ * @return list of all changed files
+ */
+fun getChangedFiles(): List<String> {
+    val modifiedFilesJson = System.getenv("MODIFIED_FILES")
+    val files = mutableListOf<String>()
+
+    if (modifiedFilesJson == null) {
+        return files
+    }
+
+    println("Modified Files: $modifiedFilesJson")
+
+    // Parse the JSON string into a list of files
+    val modifiedFiles = JsonSlurper().parseText(modifiedFilesJson) as List<*>
+
+    modifiedFiles.forEach {
+        files.add(it.toString())
+    }
+
+    // Return the list of touched files
+    return files
+}