[Build] Migrate most of the build logic from Project.buildDir usage

It's going to be deprecated in Gradle 8.3

There's currently no way to pass a `org.gradle.api.provider.Provider` to the JavaExec.systemProperty or Test.systemProperty. There's a workaround using `org.gradle.process.CommandLineArgumentProvider`, but I intentionally don't rework these calls as Gradle is going to allow passing providers to configure system properties: https://github.com/gradle/gradle/issues/12247#issuecomment-1568427242
^KTI-1473 In Progress

libraries/tools/jdk-api-validator/build.gradle.kts

@@ -25,7 +25,7 @@ dependencies {
     signature("org.codehaus.mojo.signature:java16:1.1@signature")
 }
 
-val signaturesDirectory = buildDir.resolve("signatures")
+val signaturesDirectory = layout.buildDirectory.get().asFile.resolve("signatures")
 
 val collectSignatures by tasks.registering(Sync::class) {
     from(signature)

libraries/tools/kotlin-gradle-plugin-idea-for-compatibility-tests/build.gradle.kts

@@ -64,7 +64,7 @@ val outgoingClasspath by configurations.creating {
 }
 
 tasks.register<Delete>("clean") {
-    delete(project.buildDir)
+    delete(layout.buildDirectory)
 }
 
 //endregion

libraries/tools/kotlin-gradle-plugin-idea-proto/build.gradle.kts

@@ -94,11 +94,12 @@ run {
         implicitDependencies("com.google.protobuf:protoc:3.21.9:windows-x86_64@exe")
     }
 
-    val protocExecutable = buildDir.resolve("protoc/bin")
+    val protocExecutable = layout.buildDirectory.file("protoc/bin")
     val setupProtoc = tasks.register("setupProtoc") {
         doFirst {
-            protoc.files.single().copyTo(protocExecutable, overwrite = true)
-            protocExecutable.setExecutable(true)
+            val protocFile = protocExecutable.get().asFile
+            protoc.files.single().copyTo(protocFile, overwrite = true)
+            protocFile.setExecutable(true)
         }
     }
 
@@ -122,16 +123,16 @@ run {
 
         workingDir(project.projectDir)
 
-        commandLine(
-            *arrayOf(
-                protocExecutable.absolutePath,
+        argumentProviders.add {
+            listOf(
+                protocExecutable.get().asFile.absolutePath,
                 "-I=$protoSources",
                 "--java_out=${javaOutput.absolutePath}",
                 "--kotlin_out=${kotlinOutput.absolutePath}"
             ) + protoSources.listFiles().orEmpty()
                 .filter { it.extension == "proto" }
-                .map { it.path },
-        )
+                .map { it.path }
+        }
     }
 }
 

libraries/tools/kotlin-gradle-plugin-integration-tests/build.gradle.kts

@@ -126,7 +126,7 @@ val cleanTestKitCacheTask = tasks.register<Delete>("cleanTestKitCache") {
     group = "Build"
     description = "Deletes temporary Gradle TestKit cache"
 
-    delete(project.buildDir.resolve("testKitCache"))
+    delete(layout.buildDirectory.dir("testKitCache"))
 }
 
 tasks.register<Delete>("cleanUserHomeKonanDir") {

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/commonize-kt-56729-consume-library-with-two-roots/consumer/build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
 }
 
 repositories {
-    maven(project(":producer").buildDir.resolve("repo"))
+    maven(project(":producer").layout.buildDirectory.dir("repo"))
     mavenLocal()
     mavenCentral()
 }

libraries/tools/kotlin-main-kts/build.gradle.kts

@@ -68,7 +68,7 @@ noDefaultJar()
 val relocatedJar by task<ShadowJar> {
     configurations = listOf(relocatedJarContents)
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
-    destinationDirectory.set(File(buildDir, "libs"))
+    destinationDirectory.set(layout.buildDirectory.dir("libs"))
     archiveClassifier.set("before-proguard")
 
     // don't add this files to resources classpath to avoid IDE exceptions on kotlin project
@@ -87,7 +87,7 @@ val proguard by task<CacheableProguardTask> {
 
     injars(mapOf("filter" to "!META-INF/versions/**,!kotlinx/coroutines/debug/**"), relocatedJar.get().outputs.files)
 
-    outjars(fileFrom(buildDir, "libs", "$jarBaseName-$version-after-proguard.jar"))
+    outjars(layout.buildDirectory.file("libs/$jarBaseName-$version-after-proguard.jar"))
 
     javaLauncher.set(project.getToolchainLauncherFor(JdkMajorVersion.JDK_1_8))