Implement project secrets graphql query

Erick Bajaorequested to merge
eb-list-project-secrets into master

What does this MR do and why?

Resolves #470372 (closed)

This implements the GraphQL query endpoint for listing project secrets.

Also, based on #499130 (comment 2253587250), here we are doing our first attempt to directly use Faraday to consume OpenBao API.

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