Remove injecting developer options into Settings itself

- It can improve performance because we use less injected item
- Also use RestrictedPreference instead just checking restrictions,
  so we follow policy transparency.

Note: Renamed DevelopmentSettingsDashboardActivity to
DevelopmentSettingsActivity,
because DevelopmentSettingsDashboardActivity could in disabled state
even after Settings upgrades, use a new name to prevent this issue.

Bug: 311604902
Test: manual - turn on / off Developer Options
Test: unit test
Change-Id: I17be117ae59e59410687e6d08fd5edd034d0508f

tests/robotests/src/com/android/settings/development/DevelopmentSettingsDisabledActivityTest.java

@@ -1,43 +0,0 @@
-/*
- * Copyright (C) 2017 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.
- */
-
-package com.android.settings.development;
-
-import static com.google.common.truth.Truth.assertThat;
-
-import android.content.Context;
-
-import com.android.settings.R;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.robolectric.Robolectric;
-import org.robolectric.RobolectricTestRunner;
-import org.robolectric.RuntimeEnvironment;
-import org.robolectric.shadows.ShadowToast;
-
-@RunWith(RobolectricTestRunner.class)
-public class DevelopmentSettingsDisabledActivityTest {
-
-    @Test
-    public void launchActivity_shouldShowToast() {
-        Robolectric.setupActivity(DevelopmentSettingsDisabledActivity.class);
-
-        final Context context = RuntimeEnvironment.application;
-        assertThat(ShadowToast.getTextOfLatestToast())
-            .isEqualTo(context.getString(R.string.dev_settings_disabled_warning));
-    }
-}