BREAKING: remove deprecated files config (#25535)

The long form "files" config has been flattened into the parent.

Old:

```json
{
  "test": {
    "files": {
      "include": ["**/*.ts"],
      "exclude": ["ignore.ts"]
    }
  }
}
```

New:

```json
{
  "test": {
    "include": ["**/*.ts"],
    "exclude": ["ignore.ts"]
  }
}
```

This was deprecated some time ago, but we're removing it now in Deno
2.0.

Closes #25415

1 files changed, 2 insertions, 2 deletions

diff --git a/tools/lint.js b/tools/lint.js
index d8dc29655..e692110fa 100755
--- a/tools/lint.js
+++ b/tools/lint.js
@@ -203,7 +203,7 @@ async function ensureNoNewITests() {
     "coverage_tests.rs": 0,
     "eval_tests.rs": 0,
     "flags_tests.rs": 0,
-    "fmt_tests.rs": 17,
+    "fmt_tests.rs": 16,
     "info_tests.rs": 18,
     "init_tests.rs": 0,
     "inspector_tests.rs": 0,
@@ -223,7 +223,7 @@ async function ensureNoNewITests() {
     "run_tests.rs": 348,
     "shared_library_tests.rs": 0,
     "task_tests.rs": 30,
-    "test_tests.rs": 75,
+    "test_tests.rs": 74,
     "upgrade_tests.rs": 0,
     "vendor_tests.rs": 1,
     "watcher_tests.rs": 0,