Firestore: Improve test name of "missing index" error message tests (#5602)

Author: dconeybe

firebase-firestore/src/androidTest/java/com/google/firebase/firestore/AggregationTest.java

@@ -887,7 +887,7 @@ public void testPerformsAverageOnlyOnNumericFields() {
   }
 
   @Test
-  public void testAggregateFailWithGoodMessageIfMissingIndex() {
+  public void testAggregateErrorMessageShouldContainConsoleLinkIfMissingIndex() {
     assumeFalse(
         "Skip this test when running against the Firestore emulator because the "
             + "Firestore emulator does not use indexes and never fails with a 'missing index'"

firebase-firestore/src/androidTest/java/com/google/firebase/firestore/CountTest.java

@@ -262,7 +262,7 @@ public void testCountFailWithoutNetwork() {
   }
 
   @Test
-  public void testCountFailWithGoodMessageIfMissingIndex() {
+  public void testCountErrorMessageShouldContainConsoleLinkIfMissingIndex() {
     assumeFalse(
         "Skip this test when running against the Firestore emulator because the Firestore emulator "
             + "does not use indexes and never fails with a 'missing index' error",