docs: Add release notes for prefect-databricks==0.4.1

[devin-ai-integration]

Adds release notes for prefect-databricks==0.4.1, covering changes since the prefect-databricks-0.4.0 tag.

Included PRs:

• Enhancements: Partner user agent attribution for Databricks REST clients (fix(databricks): add partner user agent attribution #22094)
• Documentation: Docs/docstring rewrites (Docs: update prefect-databricks docs #22348), mdxify API ref setup (Set up automatic prefect-databricks API reference docs via mdxify #20719), API ref regeneration with empty stub removal (docs: regenerate API refs with mdxify >=0.2.45 (drop empty stubs) #22344), redirect additions (docs: redirects for removed SDK stubs + fix databricks broken link #22349)
• Maintenance: API ref anchor targeting fix (Add release notes for prefect-dbt==0.7.18 and fix integration API ref generation #20789)

No prefect lower-bound bump needed — no new prefect APIs are consumed.

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • N/A — release notes only
• If this pull request adds new functionality, it includes unit tests that cover the changes
• If this pull request removes docs files, it includes redirect settings in mint.json.
• If this pull request adds functions or classes, it includes helpful docstrings.

Link to Devin session: https://app.devin.ai/sessions/68ad509069a94a718cbbecb3068e9c33
Requested by: @desertaxle

[devin-ai-integration]

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