refactor(yarn2): Port isCorepackEnabledInManifest() to KxS

Signed-off-by: Frank Viernau <frank_viernau@epam.com>

plugins/package-managers/node/src/main/kotlin/PackageJson.kt

@@ -105,6 +105,7 @@ data class PackageJson(
     val from: String? = null,
     @SerialName("_integrity")
     val integrity: String? = null,
+    val packageManager: String? = null,
     /** This property does not belong to package.json but to the JSON returned by 'npm info'. */
     val dist: Distribution? = null
 ) {

plugins/package-managers/node/src/main/kotlin/yarn2/Yarn2.kt

@@ -19,8 +19,6 @@
 
 package org.ossreviewtoolkit.plugins.packagemanagers.node.yarn2
 
-import com.fasterxml.jackson.module.kotlin.contains
-
 import java.io.File
 
 import kotlinx.coroutines.Dispatchers
@@ -130,11 +128,6 @@ class Yarn2(
          */
         private const val MANIFEST_FILE = "package.json"
 
-        /**
-         * The name of the property that defines the package manager and its version if Corepack is enabled.
-         */
-        private const val PACKAGE_MANAGER_PROPERTY = "packageManager"
-
         /**
          * The name of the default executable. This is used when the [OPTION_COREPACK_OVERRIDE] option is set.
          */
@@ -146,7 +139,8 @@ class Yarn2(
          */
         private fun isCorepackEnabledInManifest(workingDir: File): Boolean =
             runCatching {
-                PACKAGE_MANAGER_PROPERTY in jsonMapper.readTree(workingDir.resolve(MANIFEST_FILE))
+                val packageJson = parsePackageJson(workingDir.resolve(MANIFEST_FILE))
+                !packageJson.packageManager.isNullOrEmpty()
             }.getOrDefault(false)
     }