[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

prepare/build.version/build.gradle.kts

@@ -2,23 +2,25 @@
 
 import java.io.File
 
-val buildVersionFilePath = "$buildDir/build.txt"
+val buildVersionFilePath = layout.buildDirectory.file("build.txt")
 val buildVersion by configurations.creating
 val buildNumber: String by rootProject.extra
 val kotlinVersion: String by rootProject.extra
 
 val writeBuildNumber by tasks.registering {
-    val versionFile = File(buildVersionFilePath)
+    val versionFile = buildVersionFilePath
     val buildNumber = buildNumber
     inputs.property("version", buildNumber)
     outputs.file(versionFile)
     doLast {
-        versionFile.parentFile.mkdirs()
-        versionFile.writeText(buildNumber)
+        with(versionFile.get().asFile) {
+            parentFile.mkdirs()
+            writeText(buildNumber)
+        }
     }
 }
 
-artifacts.add(buildVersion.name, file(buildVersionFilePath)) {
+artifacts.add(buildVersion.name, buildVersionFilePath) {
     builtBy(writeBuildNumber)
 }
 

prepare/compiler/build.gradle.kts

@@ -80,8 +80,6 @@ val buildNumber by configurations.creating
 
 val compilerBaseName = name
 
-val outputJar = fileFrom(buildDir, "libs", "$compilerBaseName.jar")
-
 val compilerModules: Array<String> by rootProject.extra
 
 val distLibraryProjects = listOfNotNull(
@@ -261,7 +259,7 @@ val distSbomTask = configureSbom(
 
 val packCompiler by task<Jar> {
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
-    destinationDirectory.set(File(buildDir, "libs"))
+    destinationDirectory.set(layout.buildDirectory.dir("libs"))
     archiveClassifier.set("before-proguard")
 
     dependsOn(fatJarContents)
@@ -315,7 +313,7 @@ val proguard by task<CacheableProguardTask> {
         provider { packCompiler.get().outputs.files.singleFile }
     )
 
-    outjars(fileFrom(buildDir, "libs", "$compilerBaseName-after-proguard.jar"))
+    outjars(layout.buildDirectory.file("libs/$compilerBaseName-after-proguard.jar"))
 
     libraryjars(mapOf("filter" to "!META-INF/versions/**"), proguardLibraries)
     libraryjars(
@@ -340,7 +338,7 @@ val proguard by task<CacheableProguardTask> {
         )
     )
 
-    printconfiguration("$buildDir/compiler.pro.dump")
+    printconfiguration(layout.buildDirectory.file("compiler.pro.dump"))
 }
 
 val pack = if (kotlinBuildProperties.proguard) proguard else packCompiler

prepare/ide-plugin-dependencies/kotlin-backend-native-for-ide/build.gradle.kts

@@ -44,7 +44,7 @@ idePluginDependency {
     val shadowJar by task<ShadowJar> {
         configurations = listOf(embedded)
         duplicatesStrategy = DuplicatesStrategy.FAIL
-        destinationDirectory.set(File(buildDir, "libs"))
+        destinationDirectory.set(layout.buildDirectory.dir("libs"))
         archiveClassifier.set("shadow")
     }
 
@@ -53,7 +53,7 @@ idePluginDependency {
 
         configuration(fileFrom(projectDir, "backend-native-for-ide.pro"))
         injars(mapOf("filter" to "!META-INF/versions/**"), shadowJar.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))