HASURA_GRAPHQL_SCHEMA_POLL_INTERVAL is not working

### Version Information

Server Version: hasura/graphql-engine:v2.33.4-ce
CLI Version (for CLI related issue): -

### Environment

OSS

### What is the current behaviour?

I want to use `auto-suspend` on Neon.tech, but not woking.
I read this [issue](https://github.com/hasura/graphql-engine/issues/6527), and I set HASURA_GRAPHQL_SCHEMA_POLL_INTERVAL env to `0` .

### What is the expected behaviour?

auto-suspend work.

### How to reproduce the issue?

1. Prepare neon (https://neon.tech/docs/introduction)
2. Set neon db url on HASURA_GRAPHQL_DATABASE_URL var
3. Wait auto suspend delay (default 300 sec)

Start by reproducing the issue with HASURA_GRAPHQL_DATABASE_URL pointing to Neon and HASURA_GRAPHQL_SCHEMA_POLL_INTERVAL set to 0, then wait for the documented auto-suspend delay. No source file or test is named; done means identifying why the setting does not allow auto-suspend and adding verified behavior for this configuration.

Written by the indexing model from the issue text.