Report in FUS tracking of prepareKotlinBuildScriptModel invocations

Currently, if user creates new project using wizard, there are several
invocations of Gradle. It is difficult to identify import process
itself. Now it could be done by monitoring invocations of
prepareKotlinBuildScriptModel task.
#KT-54998 Fixed

libraries/tools/kotlin-gradle-statistics/src/common/kotlin/org/jetbrains/kotlin/statistics/metrics/BooleanMetrics.kt

@@ -32,6 +32,7 @@ enum class BooleanMetrics(val type: BooleanOverridePolicy, val anonymization: Bo
 
     // Enabled features
     BUILD_SRC_EXISTS(OR, SAFE),
+    BUILD_PREPARE_KOTLIN_BUILD_SCRIPT_MODEL(OR, SAFE),
     GRADLE_BUILD_CACHE_USED(OVERRIDE, SAFE),
     GRADLE_WORKER_API_USED(OVERRIDE, SAFE),