Configuration: Restore dependency on gradle plugin in buildscript block

#KT-24671 Fixed

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/GradleKotlinFrameworkSupportProvider.kt

@@ -121,6 +121,8 @@ abstract class GradleKotlinFrameworkSupportProvider(
 
         if (useNewSyntax) {
             updateSettingsScript(module) { updateSettingsScript(it, specifyPluginVersionIfNeeded) }
+        } else {
+            buildScriptData.addBuildscriptDependencyNotation(KotlinWithGradleConfigurator.CLASSPATH)
         }
     }
 

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinWithGradleConfigurator.kt

@@ -267,6 +267,8 @@ abstract class KotlinWithGradleConfigurator : KotlinProjectConfigurator {
         val GROUP_ID = "org.jetbrains.kotlin"
         val GRADLE_PLUGIN_ID = "kotlin-gradle-plugin"
 
+        val CLASSPATH = "classpath \"$GROUP_ID:$GRADLE_PLUGIN_ID:\$kotlin_version\""
+
         private val KOTLIN_BUILD_SCRIPT_NAME = "build.gradle.kts"
         private val KOTLIN_SETTINGS_SCRIPT_NAME = "settings.gradle.kts"
 

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinWithGradleConfigurator.kt.as31

@@ -272,6 +272,8 @@ abstract class KotlinWithGradleConfigurator : KotlinProjectConfigurator {
         val GROUP_ID = "org.jetbrains.kotlin"
         val GRADLE_PLUGIN_ID = "kotlin-gradle-plugin"
 
+        val CLASSPATH = "classpath \"$GROUP_ID:$GRADLE_PLUGIN_ID:\$kotlin_version\""
+
         private val KOTLIN_BUILD_SCRIPT_NAME = "build.gradle.kts"
         private val KOTLIN_SETTINGS_SCRIPT_NAME = "settings.gradle.kts"
 

idea/idea-gradle/src/org/jetbrains/kotlin/idea/configuration/KotlinWithGradleConfigurator.kt.as32

@@ -272,6 +272,8 @@ abstract class KotlinWithGradleConfigurator : KotlinProjectConfigurator {
         val GROUP_ID = "org.jetbrains.kotlin"
         val GRADLE_PLUGIN_ID = "kotlin-gradle-plugin"
 
+        val CLASSPATH = "classpath \"$GROUP_ID:$GRADLE_PLUGIN_ID:\$kotlin_version\""
+
         private val KOTLIN_BUILD_SCRIPT_NAME = "build.gradle.kts"
         private val KOTLIN_SETTINGS_SCRIPT_NAME = "settings.gradle.kts"