Introduce boolean flags to show/hide Encryption status.

This adds one new flag:
config_show_encryption_and_credentials_encryption_status

Which when set to false, will hide Encryption status from Encryption &
credentials. This is when the storage is not being handed by Android,
and so this preference would not be necessarily correct.

Bug: 74127210
Test: Updated robotests
Change-Id: I13665fa369086ef29a4de5f99a78bfbaf96f2f6b
(cherry picked from commit 2d5df469d3)

tests/robotests/src/com/android/settings/security/EncryptionStatusPreferenceControllerTest.java

@@ -67,6 +67,23 @@ public class EncryptionStatusPreferenceControllerTest {
         assertThat(mController.isAvailable()).isFalse();
     }
 
+    @Test
+    @Config(qualifiers = "mcc999")
+    public void isAvailable_notVisible_false() {
+        assertThat(mController.isAvailable()).isFalse();
+    }
+
+    @Test
+    @Config(qualifiers = "mcc999")
+    public void isAvailable_notVisible_butNotDetailPage_true() {
+        mController = new EncryptionStatusPreferenceController(mContext,
+                PREF_KEY_ENCRYPTION_SECURITY_PAGE);
+
+        UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
+        Shadows.shadowOf(userManager).setIsAdminUser(true);
+        assertThat(mController.isAvailable()).isTrue();
+    }
+
     @Test
     public void updateSummary_encrypted_shouldSayEncrypted() {
         ShadowLockPatternUtils.setDeviceEncryptionEnabled(true);