Resolver class fails to register with provider wrapper that specifies useFactory

I’m submitting a…

[ ] Regression 
[x] Bug report
[ ] Feature request
[x] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

When including a class decorated with @Resolver() via a FactoryProvider, it is not registered with the Nest.js GraphQL module

Expected behavior

Expected that useFactory would work the same way as passing the resolver class directly into the providers array. Selected documentation issue / request as unsure if this approach is supported or not. docs for reference

Minimal reproduction of the problem with instructions

Minimal reproduction - steps in README

Environment

Nest version: 8.0.6
Tested in 7.x.x too - same behaviour
 
For Tooling issues:
- Node version: 12.16.2
- Platform:  Linux

Others:
    "@apollo/gateway": "^0.38.0",
    "@nestjs/common": "^8.0.6",
    "@nestjs/core": "^8.0.6",
    "@nestjs/graphql": "^8.0.2",
    "graphql": "^15.5.1",
    "reflect-metadata": "^0.1.13",

[kamilmysliwiec]

Let’s track this here https://github.com/nestjs/graphql/pull/1733

[kamilmysliwiec]

Would you like to create a PR for this issue?