fixup insights build (#4929)

* fixup insights build

After #4866

looks like removing the singleton setting for react-router-dom was premature,
putting back, with an explicit version which is now required

No-Issue

* oh, the version field was just renamed, still accepts *

* update webpack check to cope with new fec format

.github/workflows/pr-checks.yml

@@ -145,7 +145,7 @@ jobs:
               perl -ne 'print unless /^[0-9a-f]{64,64}$/d' |
               grep -v '^Current branch:' |
               grep -v '^Waiting for ' |
-              grep -v '^Root folder:' > ~/webpack-config/"$version"/"$file".json
+              grep -v 'Root folder:' > ~/webpack-config/"$version"/"$file".json
           done
 
           popd

config/webpack.base.config.js

@@ -209,6 +209,11 @@ module.exports = (inputConfigs) => {
           exposes: {
             './RootApp': resolve(__dirname, '../src/entry-insights.tsx'),
           },
+          shared: [
+            {
+              'react-router-dom': { singleton: true, version: '*' },
+            },
+          ],
         },
       ),
     );