Use processResources task to copy compiler.xml to IDEA plugin

This fixes tests broken in 4b2d281bba and 95f9884799

idea/build.gradle.kts

@@ -89,6 +89,11 @@ dependencies {
     }
 }
 
+val processResources: Copy by tasks
+processResources.from("../compiler/cli/src") {
+    include("META-INF/extensions/compiler.xml")
+}
+
 sourceSets {
     "main" {
         projectDefault()
@@ -105,11 +110,6 @@ sourceSets {
     }
 }
 
-val jar: Jar by tasks
-jar.from("../compiler/cli/src") {
-    include("META-INF/extensions/compiler.xml")
-}
-
 projectTest {
     dependsOnTaskIfExistsRec("dist", project = rootProject)
     workingDir = rootDir

prepare/idea-plugin/build.gradle.kts

@@ -92,9 +92,6 @@ dependencies {
 
 val jar = runtimeJar(task<ShadowJar>("shadowJar")) {
     from(files("$rootDir/resources/kotlinManifest.properties"))
-    from(files("$rootDir/compiler/cli/src")) {
-        include("META-INF/extensions/compiler.xml")
-    }
     from(packedJars)
     for (p in projectsToShadow) {
         dependsOn("$p:classes")