Add auth.credentials_login permission to default-user

[otaviojacobi]

This is a step towards enabling more granular logins. Once this is merged we will want to enforce the user has this permission when logg n in here:

open-balena-api/src/features/auth/index.ts

Line 28 in 423fc58

app.post('/login_', loginRateLimiter('body.username'), login(onLogin));

This can't be done directly using the middleware.permissionRequired because this middleware requires a partiallyAuthenticatedUser to work. So we can just enforce it on the login method, as: https://github.com/balena-io/open-balena-api/pull/1654/files#diff-09036ece83a65b9a83897a8dd10e51dec832301f86fe4a21aed2b76d3ef98050R27-R31 in here

We also want to have a "auth.service_account_login" for SSO providers and enforce it, but on balena-api. On SAML specific, the saml role won't have these permissions.

Change-type: minor