Remove stale banner (#5400)

## What are you changing in this pull request and why?

- Remove stale banner in section
https://docs.getdbt.com/docs/dbt-cloud-apis/discovery-use-cases-and-examples#what-happened-with-my-job-run
- Remove snippet MD file for the banner (last reference)

per [slack
convo](https://dbt-labs.slack.com/archives/C02NCQ9483C/p1714413106941799)

## Checklist

- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.
- [x] For [docs
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#about-versioning),
review how to [version a whole
page](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
and [version a block of
content](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-blocks-of-content).


Removing pages (delete if not applicable):
- [x] Add/remove page in `website/sidebars.js` -- N/A since it's a
partial/snippet
- [x] Add an entry for deleted pages in `website/vercel.json` -- N/A
since it's a snippet/partial
- [x] Run link testing locally with `npm run build` to update the links
that point to deleted pages

website/docs/docs/dbt-cloud-apis/discovery-use-cases-and-examples.md

@@ -212,10 +212,6 @@ query ($environmentId: BigInt!, $first: Int!) {
 
 You can query the metadata at the job level to review results for specific runs. This is helpful for historical analysis of deployment performance or optimizing particular jobs.
 
-import DiscoveryApiJobDeprecationNotice from '/snippets/_discovery_api_job_deprecation_notice.md';
-
-<DiscoveryApiJobDeprecationNotice />
-
 <details>
 <summary>Example query</summary>