chore: Replace FallThroughError with UnsupportedError (#10087)

Author: dcharkes

packages/cloud_firestore/cloud_firestore_platform_interface/lib/src/platform_interface/utils/load_bundle_task_state.dart

@@ -14,6 +14,6 @@ LoadBundleTaskState convertToTaskState(String state) {
     case 'error':
       return LoadBundleTaskState.error;
     default:
-      throw FallThroughError();
+      throw UnsupportedError('Unknown LoadBundleTaskState value: $state.');
   }
 }

packages/cloud_firestore/cloud_firestore_web/lib/src/utils/web_utils.dart

@@ -68,7 +68,7 @@ DocumentChangeType convertWebDocumentChangeType(String changeType) {
     case _kChangeTypeRemoved:
       return DocumentChangeType.removed;
     default:
-      throw FallThroughError();
+      throw UnsupportedError('Unknown DocumentChangeType: $changeType.');
   }
 }
 

packages/firebase_auth/firebase_auth_platform_interface/lib/src/action_code_info.dart

@@ -62,7 +62,7 @@ class ActionCodeInfo {
       case 6:
         return ActionCodeInfoOperation.revertSecondFactorAddition;
       default:
-        throw FallThroughError();
+        throw UnsupportedError('Unknown ActionCodeInfoOperation: $_operation.');
     }
   }
 

packages/firebase_auth/firebase_auth_platform_interface/test/action_code_info_test.dart

@@ -111,13 +111,13 @@ void main() {
       });
 
       test(
-          'throws a [FallThroughError] when operation does not match a known type',
+          'throws a [UnsupportedError] when operation does not match a known type',
           () {
         ActionCodeInfo testActionCodeInfo =
             ActionCodeInfo(operation: -1, data: kMockData);
 
         expect(() => testActionCodeInfo.operation,
-            throwsA(isA<FallThroughError>()));
+            throwsA(isA<UnsupportedError>()));
       });
     });
   });

packages/firebase_auth/firebase_auth_web/lib/src/utils/web_utils.dart

@@ -265,7 +265,7 @@ auth_interop.AuthProvider convertPlatformAuthProvider(
     return auth_interop.SAMLAuthProvider(authProvider.providerId);
   }
 
-  throw FallThroughError();
+  throw UnsupportedError('Unknown AuthProvider: $authProvider.');
 }
 
 /// Converts a [auth_interop.AuthCredential] into a [AuthCredential].