Retrieve list of user credentials

Returns a list of credentials for the authenticated user with full credential details by default
to optimize UI performance and eliminate N+1 API call patterns. The response excludes sensitive
information like passwords but includes usernames, state info, and metadata.

Use detailed=false for minimal responses containing only auth_id strings when performance is critical.
When detailed=false, the response is a flat JSON array of UUID strings (not objects).
Optionally filter by data product ID or other application contexts.

Language
Credentials
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