tests: Add ways to run privileged tests without KVM

These will be skipped by default, but can be run from a TTY for easier
debugging by doing:

    dbus-run-session -- meson test -C build --suite mutter/native/tty --setup plain

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2151>

src/tests/meson.build

@@ -395,7 +395,7 @@ if have_native_tests
   )
 endif
 
-if have_kvm_tests
+if have_kvm_tests or have_tty_tests
   privileged_tests = [
     [ 'kms-render', native_kms_render_tests ],
   ]
@@ -403,4 +403,18 @@ if have_kvm_tests
   if have_kvm_tests
     subdir('kvm')
   endif
+
+  if have_tty_tests
+    foreach test: privileged_tests
+      test_name = test[0]
+      test_executable = test[1]
+
+      test('native-' + test_name, test_executable,
+        suite: ['core', 'mutter/native/tty'],
+        env: test_env,
+        is_parallel: false,
+        timeout: 60,
+      )
+    endforeach
+  endif
 endif