Add missing android lint to linux_unopt. (#43099)

The test was not migrated to v2.

Bug: https://github.com/flutter/flutter/issues/127759

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

ci/builders/linux_unopt.json

diff --git a/ci/builders/linux_unopt.json b/ci/builders/linux_unopt.json
index f718a45..6058544 100644
--- a/ci/builders/linux_unopt.json
+++ b/ci/builders/linux_unopt.json
@@ -5,9 +5,6 @@
                 "device_type=none",
                 "os=Linux"
             ],
-            "gclient_variables": {
-                "download_android_deps": false
-            },
             "gn": [
                 "--runtime-mode",
                 "debug",
@@ -62,6 +59,11 @@
                         "out/host_debug_unopt/flutter_tester",
                         "flutter/shell/testing/observatory/empty_main.dart"
                     ]
+                },
+                {
+                    "language": "dart",
+                    "name": "test: Lint android host",
+                    "script": "flutter/tools/android_lint/bin/main.dart"
                 }
             ]
         },