Add tsconfig for url_forwarding

Also add missing pieces to kibana_react, as a follow-up to elastic#80992.

References elastic#80508
References elastic#81003

src/plugins/kibana_legacy/public/utils/private.d.ts

@@ -18,3 +18,5 @@
  */
 
 export type IPrivate = <T>(provider: (...injectable: any[]) => T) => T;
+
+export function PrivateProvider(): void;

tsconfig.json

@@ -10,7 +10,8 @@
     "src/core/**/*",
     "src/plugins/kibana_legacy/**/*",
     "src/plugins/kibana_react/**/*",
-    "src/plugins/kibana_utils/**/*"
+    "src/plugins/kibana_utils/**/*",
+    "src/plugins/url_forwarding/**/*"
     // In the build we actually exclude **/public/**/* from this config so that
     // we can run the TSC on both this and the .browser version of this config
     // file, but if we did it during development IDEs would not be able to find

tsconfig.refs.json

@@ -3,7 +3,9 @@
   "references": [
     { "path": "./src/test_utils/tsconfig.json" },
     { "path": "./src/core/tsconfig.json" },
-    { "path": "./src/plugins/kibana_utils/tsconfig.json" },
+    { "path": "./src/plugins/kibana_legacy/tsconfig.json" },
     { "path": "./src/plugins/kibana_react/tsconfig.json" },
+    { "path": "./src/plugins/kibana_utils/tsconfig.json" },
+    { "path": "./src/plugins/url_forwarding/tsconfig.json" }
   ]
 }