[repo] Migrate report.gradle.kts into convention plugin

Otherwise, it could not find methods from buildsrc-compat.

build.gradle.kts

@@ -34,6 +34,7 @@ plugins {
     idea
     id("jps-compatible")
     id("org.jetbrains.gradle.plugin.idea-ext") version "1.0.1" // this version should be in sync with repo/buildsrc-compat/build.gradle.kts
+    id("build-time-report")
     id("org.gradle.crypto.checksum") version "1.4.0"
     id("org.jetbrains.kotlinx.binary-compatibility-validator") version "0.13.1" apply false
     signing
@@ -87,7 +88,6 @@ extra["isSonatypeRelease"] = false
 
 rootProject.apply {
     from(rootProject.file("gradle/versions.gradle.kts"))
-    from(rootProject.file("gradle/report.gradle.kts"))
     from(rootProject.file("gradle/javaInstrumentation.gradle.kts"))
     from(rootProject.file("gradle/jps.gradle.kts"))
     from(rootProject.file("gradle/checkArtifacts.gradle.kts"))

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/build-time-report.gradle.kts

@@ -2,6 +2,7 @@
  * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
+@file:Suppress("DEPRECATION")
 
 import org.gradle.api.Task
 import org.gradle.api.invocation.Gradle