[Feature Request] Allow for globally disabling cookies on requests

- Insomnia Version: 6.3.2
- Operating System: Mac OSX Mojave 10.14.4

## Details

Quality of life improvement thought:

I work a lot with authenticated REST and GraphQL APIs. In a some cases, the API I'm interacting with does not behave well when the request includes cookies. Shopify's APIs for example behave this way.

To me it seems like it would be super convenient to allow for the ability to globally disable sending cookies with requests, at least as the default state. While I can control it from request-to-request, and that these preferences are inherited if I copy a request with the intended settings, it feels pretty uncomfortable in the cases where I end up having to specify the setting.

The issue names no files or tests. Start by locating the existing per-request cookie preference and trace how its value is inherited; done means a global default can disable cookies for requests while preserving request-level control.

Written by the indexing model from the issue text.