[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

compiler/fir/analysis-tests/build.gradle.kts

@@ -68,7 +68,7 @@ fun Test.configureTest(configureJUnit: JUnitPlatformOptions.() -> Unit = {}) {
     useJUnitPlatform {
         configureJUnit()
     }
-    useJsIrBoxTests(version = version, buildDir = "$buildDir/")
+    useJsIrBoxTests(version = version, buildDir = layout.buildDirectory)
 }