Update Databricks quickstart

[camillek-db]

What are you changing in this pull request and why?

• Specify that the quickstart assumes using Partner Connect
• Include steps to connect using Partner Connect inline
• Remove unnecessary step (set up managed repository) that's only required if connecting manually, not using Partner Connect
• Clarify required catalog/schema privileges
• Document Unity Catalog vs. legacy behavior/privileges

Checklist

• Review the Content style guide so my content adheres to these guidelines.
• For docs versioning, review how to version a whole page and version a block of content.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):

• Remove page from website/sidebars.js
• Add an entry website/static/_redirects
• Run link testing locally with npm run build to update the links that point to the deleted page

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
docs-getdbt-com	✅ Ready (Inspect)	Visit Preview		Jul 30, 2024 8:45pm

[camillek-db]

cc @benc-db

[matthewshaver]

Thank you @camillek-db Sorry it took so long to get to this.