[CQ] remove stale `test_data` directory

Change-Id: I4ff42079aa838f7014c2aa011c2fdffb2d5919df
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/403485
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Phil Quitslund <pquitslund@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
diff --git a/pkg/linter/analysis_options.yaml b/pkg/linter/analysis_options.yaml
index 14263f4..406a3d8 100644
--- a/pkg/linter/analysis_options.yaml
+++ b/pkg/linter/analysis_options.yaml
@@ -6,7 +6,6 @@
   exclude:
     # ignore vscode .history files
     - .history/**
-    - test_data/**
   language:
     strict-casts: true
     strict-raw-types: true
diff --git a/pkg/linter/test_data/analysis_options.yaml b/pkg/linter/test_data/analysis_options.yaml
deleted file mode 100644
index 13e5d8f..0000000
--- a/pkg/linter/test_data/analysis_options.yaml
+++ /dev/null
@@ -1 +0,0 @@
-# We need this file to prevent using the one from the package root.
diff --git a/pkg/linter/test_data/rules/.dart_tool/package_config.json b/pkg/linter/test_data/rules/.dart_tool/package_config.json
deleted file mode 100644
index 260e94c..0000000
--- a/pkg/linter/test_data/rules/.dart_tool/package_config.json
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-  "configVersion": 2,
-  "packages": [
-    {
-      "name": "flutter",
-      "rootUri": "../../../../analyzer_utilities/lib/test/mock_packages/package_content/flutter/",
-      "packageUri": "lib/",
-      "languageVersion": "2.17"
-    },
-    {
-      "name": "meta",
-      "rootUri": "../../../../analyzer_utilities/lib/test/mock_packages/package_content/meta/",
-      "packageUri": "lib/",
-      "languageVersion": "2.17"
-    }
-  ],
-  "generated": "2022-06-30T01:27:31.576781Z",
-  "generator": "pub",
-  "generatorVersion": "2.17.0"
-}
diff --git a/pkg/linter/test_data/rules/.gitignore b/pkg/linter/test_data/rules/.gitignore
deleted file mode 100644
index 06c9af9..0000000
--- a/pkg/linter/test_data/rules/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-# Required for mock packages.
-!.dart_tool