VmTerminalApp: Merge with LinuxInstaller

This CL includes following changes:
- Move linux_vm_setup
- Move LinuxInstaller's MainActivity as InstallerActivity
  - InstallerActivity finishes self when done
- Remove LinuxInstaller and clean up relevant codes

Bug: 369746567
Test: manually
Change-Id: I2c97e07b00e110aebe09db2760b26257ace4f7d9
diff --git a/android/TerminalApp/Android.bp b/android/TerminalApp/Android.bp
index 932ca76..e5e8b0a 100644
--- a/android/TerminalApp/Android.bp
+++ b/android/TerminalApp/Android.bp
@@ -26,3 +26,15 @@
         "com.android.virt",
     ],
 }
+
+filegroup {
+    name: "linux_vm_setup.rc",
+    srcs: ["linux_vm_setup.rc"],
+}
+
+sh_binary {
+    name: "linux_vm_setup",
+    src: "linux_vm_setup.sh",
+    init_rc: [":linux_vm_setup.rc"],
+    host_supported: false,
+}