Don't return or request the API key Id

[novakzaballa]

How are you running Flagsmith

• [X] Self Hosted with Docker
• [ ] Self Hosted with Kubernetes
• [x] SaaS at flagsmith.com
• [ ] Some other way (add details in description below)

Describe the bug

API key ID should not be returned or used in certain endpoints, for example:

POST: /api/v1/organisations/{organisation_pk}/roles/{role_pk}/master-api-keys/ GET: /api/v1/organisations/{organisation_pk}/master-api-keys/{api_key_prefix}/roles/

Steps To Reproduce

1. Navigate to the API keys tab on the organisation settings page.
2. Generate a new API key.
3. View the response in the network panel.

Expected behavior

We should be able to make requests without needing the ID.

Screenshots

No response