Creating use cases for Admin API

[runleonarun]

Fixes https://dbtlabs.atlassian.net/browse/PRODDOCS-131

What are you changing in this pull request and why?

I am adding a few use cases and examples for using the Admin API.

Checklist

• The changes in this PR meet the docs style guide/fundamentals required for all content.
• Applied the proper versioning rules if the content is for specific dbt version(s): (version a whole page or version a block of content
• The content in this PR requires a dbt release note, so I added one to the release notes page.).

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🚀 Deployment available! Here are the direct links to the updated files:

• https://docs-getdbt-com-git-admin-api-use-cases-dbt-labs.vercel.app/docs/dbt-cloud-apis/admin-api-use-cases-and-examples
• https://docs-getdbt-com-git-admin-api-use-cases-dbt-labs.vercel.app/docs/dbt-cloud-apis/discovery-use-cases-and-examples

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Name	Status	Preview	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview	Jul 7, 2025 11:56pm

[matthewshaver]

@runleonarun ok to icebox this PR?