Disable failed tests from CellInfoUtilTest

These tests are currently failing and breaking builds.

Bug: 383858953
Change-Id: Idcb2f1f122b4e03990e7242b938438e1d8bb5367
Test: NA
Flag: EXEMPT bugfix

tests/unit/src/com/android/settings/network/telephony/CellInfoUtilTest.kt

@@ -24,6 +24,7 @@ import androidx.test.ext.junit.runners.AndroidJUnit4
 import com.android.settings.network.telephony.CellInfoUtil.getNetworkTitle
 import com.android.settings.network.telephony.CellInfoUtil.getOperatorNumeric
 import com.google.common.truth.Truth.assertThat
+import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
 
@@ -95,6 +96,7 @@ class CellInfoUtilTest {
     }
 
     @Test
+    @Ignore("b/383858953")
     fun cellInfoListToString() {
         val cellInfoList =
             listOf(