Revert "Convert placeholder-tests project to use Gradle kotlin script"

This reverts commit 2d14e5cd797eeec62d2304341e3321ccedb0c715.

Reason for revert: It slows down configuration phase by 16s, needs investigation

Change-Id: I9ed3c88f038810b17f5dfeaca2e07ba220ce98b5
diff --git a/placeholder-tests/build.gradle b/placeholder-tests/build.gradle
new file mode 100644
index 0000000..20e7b60e
--- /dev/null
+++ b/placeholder-tests/build.gradle
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    id("AndroidXPlugin")
+    id("com.android.library")
+}
+
+dependencies {
+    testImplementation(libs.junit)
+    androidTestImplementation(libs.testExtJunit)
+    androidTestImplementation(libs.testCore)
+    androidTestImplementation(libs.testRunner)
+    androidTestImplementation(libs.testRules)
+}
+
+androidx {
+    name = "Dummy Project for test runner"
+}
+
+android {
+    namespace "androidx.testinfra.placeholderintegrationtest"
+}