add native_flags_health_check_enabled to Settings.Global

add native_flags_health_check_enabled to Settings.Global. It is used
to receive the corresponding experiment flag from P/H.

Bug: 119627143
Test: manual on device
Change-Id: I980f73925818a5cb6f756d78bad324bafefc3784
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 4802ebe..2145717 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -308,6 +308,7 @@
                     Settings.Global.MULTI_SIM_SMS_SUBSCRIPTION,
                     Settings.Global.MULTI_SIM_VOICE_CALL_SUBSCRIPTION,
                     Settings.Global.MULTI_SIM_VOICE_PROMPT,
+                    Settings.Global.NATIVE_FLAGS_HEALTH_CHECK_ENABLED,
                     Settings.Global.NETSTATS_DEV_BUCKET_DURATION,
                     Settings.Global.NETSTATS_DEV_DELETE_AGE,
                     Settings.Global.NETSTATS_DEV_PERSIST_BYTES,