Android: Use the shared HTTP analytics backend

We can now route Android analytics through Common::HttpAnalyticsBackend, drop the Volley sender, and keep the JNI layer limited to only transfer metadata since https://bugs.dolphin-emu.org/issues/11772 has been fixed.

Source/Android/app/build.gradle.kts

@@ -144,9 +144,6 @@ dependencies {
     implementation("androidx.leanback:leanback:1.0.0")
     implementation("androidx.tvprovider:tvprovider:1.0.0")
 
-    // For REST calls
-    implementation("com.android.volley:volley:1.2.1")
-
     // For loading game covers from disk and GameTDB
     implementation("io.coil-kt:coil:2.6.0")