console: action relationships are broken when a mssql database is connected to the instance.

### Version Information

Server Version: 2.6.1

### Environment

OSS

### What is the expected behaviour?

Users should be able to create relationships from action payloads to tables in postgres data sources

### Keywords

Action relationships postgres mssql

### What is the current behaviour?

When a mssql database is connected to the instance, and has a name that alphabetically comes before the first postgres data source,
the ui breaks and creating a relationship is impossible:

### How to reproduce the issue?

1. Create a hasura instance
2. Add a postgres source `pg1`
3. Add a mssql source `mssql1`
4. Create an action
5. Attempt to add a relationship from the action to the ps

### Screenshots or Screencast


`error`, `code`, and `path` are not schemas in the pg1 data source, and most likely come from a graphql error.