Remove outdated ignores (#162773)

Powered by the new and amazing `unnecessary_ignore` lint.

We're not enabling this lint by default because being able to
temporarily use ignores that don't ignore anything is a powerful tool to
enable migrations. We should turn this lint on locally periodically,
though, and clean up all outdated ignores.

dev/devicelab/bin/tasks/build_android_host_app_with_module_aar.dart

@@ -437,7 +437,6 @@ class ModuleTest {
 Future<void> main() async {
   await task(
     combine(<TaskFunction>[
-      // ignore: avoid_redundant_argument_values
       ModuleTest(gradleVersion: '8.4').call,
       ModuleTest(gradleVersion: '8.4-rc-3').call,
     ]),

dev/devicelab/bin/tasks/build_android_host_app_with_module_source.dart

@@ -407,10 +407,5 @@ class ModuleTest {
 }
 
 Future<void> main() async {
-  await task(
-    combine(<TaskFunction>[
-      // ignore: avoid_redundant_argument_values
-      ModuleTest(gradleVersion: '8.7').call,
-    ]),
-  );
+  await task(combine(<TaskFunction>[ModuleTest(gradleVersion: '8.7').call]));
 }