Revert "add basic signature in template (#22665)"

This reverts commit 63ebbd6bfc.

template/android/app/build.gradle

@@ -116,22 +116,8 @@ android {
             include "armeabi-v7a", "x86", "arm64-v8a", "x86-64"
         }
     }
-    signingConfigs {
-        debug {
-            storeFile file('debug.keystore')
-            storePassword 'android'
-            keyAlias 'androiddebugkey'
-            keyPassword 'android'
-        }
-    }
     buildTypes {
-        debug {
-            signingConfig signingConfigs.debug
-        }
         release {
-            // Caution! In production, you need to generate your own keystore file.
-            // see https://facebook.github.io/react-native/docs/signed-apk-android.
-            signingConfig signingConfigs.debug
             minifyEnabled enableProguardInReleaseBuilds
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
         }

template/android/keystores/_BUCK

@@ -0,0 +1,8 @@
+keystore(
+    name = "debug",
+    properties = "debug.keystore.properties",
+    store = "debug.keystore",
+    visibility = [
+        "PUBLIC",
+    ],
+)

template/android/keystores/debug.keystore.properties

@@ -0,0 +1,4 @@
+key.store=debug.keystore
+key.alias=androiddebugkey
+key.store.password=android
+key.alias.password=android