All format test cases should be under the format directory.

Currently, there exists an ecma regex test case that uses `"format": "regex"`.

My understanding was that all tests that require format validation where implemented under the `optional/format` directory. (As per point #2 of https://github.com/json-schema-org/JSON-Schema-Test-Suite/blob/9fc880bfb6d8ccd093bc82431f17d13681ffae8e/README.md#additional-assumptions).

As such, this change moves the test requiring `format` under the `optional/format` directory.

Author: big-andy-coates

tests/draft-next/optional/ecmascript-regex.json

@@ -405,20 +405,6 @@
             }
         ]
     },
-    {
-        "description": "\\a is not an ECMA 262 control escape",
-        "schema": {
-            "$schema": "https://json-schema.org/draft/next/schema",
-            "format": "regex"
-        },
-        "tests": [
-            {
-                "description": "when used as a pattern",
-                "data": "\\a",
-                "valid": false
-            }
-        ]
-    },
     {
         "description": "pattern with non-ASCII digits",
         "schema": {

tests/draft-next/optional/format/ecmascript-regex.json

@@ -0,0 +1,16 @@
+[
+  {
+    "description": "\\a is not an ECMA 262 control escape",
+    "schema": {
+      "$schema": "https://json-schema.org/draft/next/schema",
+      "format": "regex"
+    },
+    "tests": [
+      {
+        "description": "when used as a pattern",
+        "data": "\\a",
+        "valid": false
+      }
+    ]
+  }
+]

tests/draft2020-12/optional/ecmascript-regex.json

@@ -405,20 +405,6 @@
             }
         ]
     },
-    {
-        "description": "\\a is not an ECMA 262 control escape",
-        "schema": {
-            "$schema": "https://json-schema.org/draft/2020-12/schema",
-            "format": "regex"
-        },
-        "tests": [
-            {
-                "description": "when used as a pattern",
-                "data": "\\a",
-                "valid": false
-            }
-        ]
-    },
     {
         "description": "pattern with non-ASCII digits",
         "schema": {

tests/draft2020-12/optional/format/ecmascript-regex.json

@@ -0,0 +1,16 @@
+[
+  {
+    "description": "\\a is not an ECMA 262 control escape",
+    "schema": {
+      "$schema": "https://json-schema.org/draft/2020-12/schema",
+      "format": "regex"
+    },
+    "tests": [
+      {
+        "description": "when used as a pattern",
+        "data": "\\a",
+        "valid": false
+      }
+    ]
+  }
+]