Update ModerationSource values and documentation. (#8088)

* Update ModerationSource values and documentation.

* Use trusted-flagger as the default value instead of the internal detection.

* updated test

app/lib/admin/actions/moderation_case_create.dart

@@ -22,7 +22,7 @@ Returns the fields on the newly created moderation case.
         'The email of the reporter. (default value: `support@pub.dev`)',
     'kind': 'The kind of the moderation case. (default value: `notification`)',
     'source':
-        'The source of the moderation case. (default value: `internal-notification`)',
+        'The source of the moderation case. (default value: `trusted-flagger`)',
     'subject': 'The subject of the moderation case.',
     'url': 'The url of the moderation case (optional).'
   },
@@ -37,7 +37,7 @@ Returns the fields on the newly created moderation case.
     InvalidInputException.check(
         ModerationKind.isValidKind(kind), 'invalid kind');
 
-    final source = options['source'] ?? ModerationSource.internalNotification;
+    final source = options['source'] ?? ModerationSource.trustedFlagger;
     InvalidInputException.check(
         ModerationSource.isValidSource(source), 'invalid source');
 

app/lib/admin/models.dart

@@ -34,7 +34,9 @@ class ModerationCase extends db.ExpandoModel<String> {
 
   /// The source of the case, one of:
   /// - `external-notification`,
-  /// - `internal-notification` (only used for reports from @google.com accounts), or,
+  /// - `trusted-flagger`,
+  /// - `authorities`,
+  /// - `legal-referral`,
   /// - `automated-detection`. (will not be used)
   @db.StringProperty(required: true)
   late String source;
@@ -199,17 +201,17 @@ class ModerationCase extends db.ExpandoModel<String> {
 
 abstract class ModerationSource {
   static const externalNotification = 'external-notification';
-  static const internalNotification = 'internal-notification';
   static const trustedFlagger = 'trusted-flagger';
   static const authorities = 'authorities';
   static const legalReferral = 'legal-referral';
+  static const automatedDetection = 'automated-detection';
 
   static const _values = [
     externalNotification,
-    internalNotification,
     trustedFlagger,
     authorities,
     legalReferral,
+    automatedDetection,
   ];
   static bool isValidSource(String value) => _values.contains(value);
 }

app/test/admin/moderation_case_test.dart

@@ -26,7 +26,7 @@ void main() {
         'kind': 'notification',
         'opened': isNotEmpty,
         'resolved': null,
-        'source': 'internal-notification',
+        'source': 'trusted-flagger',
         'subject': 'package:oxygen',
         'isSubjectOwner': false,
         'url': null,