Fix Code Scanning Alert elastic#1292 (elastic#202125)

## Summary

Resolves [elastic#1292](elastic/kibana-team#1292)


### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

packages/kbn-router-to-openapispec/src/util.test.ts

@@ -117,10 +117,12 @@ describe('assignToPaths', () => {
     assignToPaths(paths, '/foo', {});
     assignToPaths(paths, '/bar/{id?}', {});
     assignToPaths(paths, '/bar/file/{path*}', {});
+    assignToPaths(paths, '/bar/file/{path*}/{id?}', {});
     expect(paths).toEqual({
       '/foo': {},
       '/bar/{id}': {},
       '/bar/file/{path}': {},
+      '/bar/file/{path}/{id}': {},
     });
   });
 });

packages/kbn-router-to-openapispec/src/util.ts

@@ -132,7 +132,7 @@ export const assignToPaths = (
   path: string,
   pathObject: OpenAPIV3.PathItemObject
 ): void => {
-  const pathName = path.replace(/[\?\*]/, '');
+  const pathName = path.replace(/[\?\*]/g, '');
   paths[pathName] = { ...paths[pathName], ...pathObject };
 };