Run the flutter_tools create test in online mode before testing offline mode (#89779)

Offline pub assumes that the pub cache contains all needed packages.  Running
"flutter create" in online mode first will ensure that the pub cache is populated.

Fixes https://github.com/flutter/flutter/issues/89759

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -1702,13 +1702,20 @@ void main() {
   });
 
   testUsingContext(
-    'invokes pub offline when requested',
+    'invokes pub in online and offline modes',
     () async {
       Cache.flutterRoot = '../..';
 
       final CreateCommand command = CreateCommand();
       final CommandRunner<void> runner = createTestCommandRunner(command);
 
+      // Run pub online first in order to populate the pub cache.
+      await runner.run(<String>['create', '--pub', projectDir.path]);
+      expect(loggingProcessManager.commands.first, contains(matches(r'dart-sdk[\\/]bin[\\/]dart')));
+      expect(loggingProcessManager.commands.first, isNot(contains('--offline')));
+
+      // Run pub offline.
+      loggingProcessManager.clear();
       await runner.run(<String>['create', '--pub', '--offline', projectDir.path]);
       expect(loggingProcessManager.commands.first, contains(matches(r'dart-sdk[\\/]bin[\\/]dart')));
       expect(loggingProcessManager.commands.first, contains('--offline'));
@@ -2820,4 +2827,8 @@ class LoggingProcessManager extends LocalProcessManager {
       mode: mode,
     );
   }
+
+  void clear() {
+    commands.clear();
+  }
 }