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, 0 insertions, 7 deletions

diff --git a/tests/testdata/test/collect/deno.deprecated.jsonc b/tests/testdata/test/collect/deno.deprecated.jsonc
deleted file mode 100644
index b8acda27d..000000000
--- a/tests/testdata/test/collect/deno.deprecated.jsonc
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "test": {
-    "files": {
-      "exclude": ["./ignore"]
-    }
-  }
-}