fix(tests): stop the auth0 fixture reaching the network

[chiruu12]

Fixes #6816

unit-tests has been erroring on every PR with four setup timeouts in tests/test_auth.py:

ERROR at setup of test_api_key_with_header[MULTI_TENANT] - Failed: Timeout >20.0s
socket.gaierror: [Errno -3] Temporary failure in name resolution
Failed to fetch OpenID discovery document from
  https://https://auth0domain.com/.well-known/openid-configuration

Two things behind it. Both live in tests/fixtures/client.py.

The MULTI_TENANT branch sets AUTH0_DOMAIN to https://auth0domain.com. Every other reader of that variable takes a bare host: auth0_utils formats it into "https://{}/api/v2/", the verifier builds self.issuer the same way, and tests/test_auth_new.py uses test-domain.auth0.com. With a scheme already on it the verifier asks the resolver for a host literally named https, which is the gaierror above.

The fixture also stubs OIDC discovery only for the dict form of the parameter, and MULTI_TENANT loads the same Auth0 verifier with no stub at all, so the call went out for real. On a runner without DNS that burns the whole 20 seconds before the test has started.

So: bare host, and the stub now covers both forms.

Verified by counting outbound DNS lookups during test_api_key_with_header[MULTI_TENANT]:

parent commit:  ['https']
this commit:    []

tests/test_auth.py --non-integration: 22 passed, 1 skipped, on both. The count is the evidence; the pass is not, since a resolver that answers quickly hides this.

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