fix: route CogIdP auth to dev instance for dev clusters (AUTH-4275)

[EliasBjorne]

Summary

• When PROVIDER=cdf, the OAuth token URL and CogIdP admin API base were hardcoded to the production CogIdP instance (https://auth.cognite.com), even for dev clusters.
• After the Auth team's migration (AUTH-4275), cog-dev-* orgs on dev clusters (az-arn-dev-002, aws-dub-dev, gc-bru-dev-003) now require the CogIdP dev instance (https://auth-dev.cognitedata-development.cognite.ai).
• This PR auto-detects dev clusters by checking whether the CDF_CLUSTER name contains -dev and routes accordingly — no env-var changes needed from the user.

Changed files

• cognite_toolkit/_cdf_tk/utils/auth.py — idp_token_url now returns the CogIdP dev token URL for dev clusters
• cognite_toolkit/_cdf_tk/client/config.py — create_auth_url() now builds URLs against the CogIdP dev API base for dev clusters

Test plan

• Unit test: EnvironmentVariables(CDF_CLUSTER="az-arn-dev-002", ..., PROVIDER="cdf").idp_token_url returns https://auth-dev.cognitedata-development.cognite.ai/oauth2/token
• Unit test: EnvironmentVariables(CDF_CLUSTER="westeurope-1", ..., PROVIDER="cdf").idp_token_url returns https://auth.cognite.com/oauth2/token (no regression)
• Unit test: config.create_auth_url("/principals/me") returns the correct base URL based on cluster
• Manual: run cdf auth verify against a cog-dev-ai project on az-arn-dev-002

Context

Jeremy St. Ange flagged in Slack that the CLI breaks for users of the cog-dev-ai org after the Auth team switched dev clusters to CogIdP dev as primary source of truth. Related Jira: AUTH-4275.

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