Fix: migrate compiler-warnings-error plugin to gradle

Fixes: gh-18434
Signed-off-by: paulvas <paulvas@gmail.com>

buildSrc/build.gradle

@@ -52,10 +52,6 @@ gradlePlugin {
 			id = "org.springframework.security.check-expected-branch-version"
 			implementationClass = "org.springframework.security.CheckExpectedBranchVersionPlugin"
 		}
-		compileWarningsError {
-			id = "compile-warnings-error"
-			implementationClass = "CompileWarningsErrorPlugin"
- 		}
 	}
 }
 

buildSrc/src/main/groovy/compile-warnings-error.gradle

@@ -0,0 +1,10 @@
+import org.gradle.api.tasks.compile.JavaCompile
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+tasks.withType(JavaCompile) {
+    options.compilerArgs += "-Werror"
+}
+
+tasks.withType(KotlinCompile) {
+    kotlinOptions.allWarningsAsErrors = true
+}

buildSrc/src/main/groovy/compile-warnings-error.groovy

@@ -1,15 +0,0 @@
-import org.gradle.api.Plugin
-import org.gradle.api.Project
-import org.gradle.api.tasks.compile.JavaCompile
-import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-
-class CompileWarningsErrorPlugin implements Plugin<Project> {
-    void apply(Project project) {
-        project.tasks.withType(JavaCompile) {
-            options.compilerArgs += "-Werror"
-        }
-        project.tasks.withType(KotlinCompile) {
-            kotlinOptions.allWarningsAsErrors = true
-        }
-    }
-}