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

4 files changed, 0 insertions, 40 deletions

diff --git a/tests/testdata/fmt/fmt_with_deprecated_config.out b/tests/testdata/fmt/fmt_with_deprecated_config.out
deleted file mode 100644
index 793fac1bc..000000000
--- a/tests/testdata/fmt/fmt_with_deprecated_config.out
+++ /dev/null
@@ -1,3 +0,0 @@
-Warning: "options" configuration is deprecated. Please use "flat" options instead.
-Warning: "files" configuration is deprecated. Please use "include" and "exclude" instead.
-Checked 2 files
diff --git a/tests/testdata/fmt/with_config/deno.deprecated.jsonc b/tests/testdata/fmt/with_config/deno.deprecated.jsonc
deleted file mode 100644
index e053233fd..000000000
--- a/tests/testdata/fmt/with_config/deno.deprecated.jsonc
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-  "fmt": {
-    "files": {
-      "include": [
-        "./subdir/"
-      ],
-      "exclude": [
-        "./subdir/b.ts"
-      ]
-    },
-    "options": {
-      "useTabs": true,
-      "lineWidth": 40,
-      "indentWidth": 8,
-      "singleQuote": true,
-      "proseWrap": "always",
-      "semiColons": false
-    }
-  }
-}
diff --git a/tests/testdata/test/collect.deprecated.out b/tests/testdata/test/collect.deprecated.out
deleted file mode 100644
index 7db2f276c..000000000
--- a/tests/testdata/test/collect.deprecated.out
+++ /dev/null
@@ -1,10 +0,0 @@
-Warning: "files" configuration is deprecated. Please use "include" and "exclude" instead.
-Check [WILDCARD]/test/collect/include/2_test.ts
-Check [WILDCARD]/test/collect/include/test.ts
-Check [WILDCARD]/test/collect/test.ts
-running 0 tests from [WILDCARD]/test/collect/include/2_test.ts
-running 0 tests from [WILDCARD]/test/collect/include/test.ts
-running 0 tests from [WILDCARD]/test/collect/test.ts
-
-ok | 0 passed | 0 failed ([WILDCARD])
-
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"]
-    }
-  }
-}