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, 6 deletions

diff --git a/tests/integration/fmt_tests.rs b/tests/integration/fmt_tests.rs
index c2d38f0d8..b890b3b72 100644
--- a/tests/integration/fmt_tests.rs
+++ b/tests/integration/fmt_tests.rs
@@ -291,12 +291,6 @@ itest!(fmt_with_config {
   output: "fmt/fmt_with_config.out",
 });
 
-itest!(fmt_with_deprecated_config {
-  args:
-    "fmt --config fmt/with_config/deno.deprecated.jsonc fmt/with_config/subdir",
-  output: "fmt/fmt_with_deprecated_config.out",
-});
-
 itest!(fmt_with_config_default {
   args: "fmt fmt/with_config/subdir",
   output: "fmt/fmt_with_config.out",