Make error tracking payload less strict

Different language sdk can send different attributes. We restrict
payload schema validation to bare minimum to support that.
Signed-off-by: Dmytro Zaporozhets <dzaporozhets@gitlab.com>

app/validators/json_schemas/error_tracking_event_payload.json

@@ -27,94 +27,8 @@
     "message": {
       "type": "string"
     },
-    "user": {
-      "type": "object",
-      "required": [],
-      "properties": {}
-    },
-    "tags": {
-      "type": "object",
-      "required": [],
-      "properties": {
-        "request_id": {
-          "type": "string"
-        }
-      }
-    },
     "contexts": {
-      "type": "object",
-      "required": [],
-      "properties": {
-        "os": {
-          "type": "object",
-          "required": [],
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "version": {
-              "type": "string"
-            },
-            "build": {
-              "type": "string"
-            },
-            "kernel_version": {
-              "type": "string"
-            }
-          }
-        },
-        "runtime": {
-          "type": "object",
-          "required": [],
-          "properties": {
-            "name": {
-              "type": "string"
-            },
-            "version": {
-              "type": "string"
-            }
-          }
-        },
-        "trace": {
-          "type": "object"
-        }
-      }
-    },
-    "fingerprint": {
-      "type": "array",
-      "items": {
-        "type": "string"
-      }
-    },
-    "breadcrumbs": {
-      "type": "object",
-      "required": [],
-      "properties": {
-        "values": {
-          "type": "array",
-          "items": {
-            "type": "object",
-            "required": [],
-            "properties": {
-              "category": {
-                "type": "string"
-              },
-              "data": {
-                "type": "object"
-              },
-              "message": {
-                "type": "string"
-              },
-              "timestamp": {
-                "type": "number"
-              }
-            }
-          }
-        }
-      }
-    },
-    "transaction": {
-      "type": "string"
+      "type": "object"
     },
     "platform": {
       "type": "string"
@@ -131,33 +45,6 @@
         }
       }
     },
-    "request": {
-      "type": "object",
-      "required": [],
-      "properties": {
-        "url": {
-          "type": "string"
-        },
-        "method": {
-          "type": "string"
-        },
-        "headers": {
-          "type": "object"
-        },
-        "env": {
-          "type": "object",
-          "required": [],
-          "properties": {
-            "SERVER_NAME": {
-              "type": "string"
-            },
-            "SERVER_PORT": {
-              "type": "string"
-            }
-          }
-        }
-      }
-    },
     "exception": {
       "type": "object",
       "required": [],