Operation extraction should not require a key

**Intended outcome:**
A JSON manifest of the operations and its signatures is generated when running `apollo client:extract` on apollo/client.

**Actual outcome:**
```
CLIError: Error in "Loading schema for my-apollo-service": Error: No API key found. Please set APOLLO_KEY or use --key
````

**How to reproduce the issue:**
Running `apollo client:extract` in a repository with an `apollo.config.js` file configured with no APOLLO_KEY set.

**Versions**
@apollo/client@2.33.9

Start by reproducing `apollo client:extract` in a repository with `apollo.config.js` and no `APOLLO_KEY`, then trace the CLI's schema-loading path. The change is complete when extraction produces the operations-and-signatures JSON manifest without requiring an API key.

Written by the indexing model from the issue text.