[DOC-11682] Fix redirect to new Cloud upgrade page

[mdlinville]

[DOC-11682] Fix redirect to new Cloud upgrade page

This was due to my misunderstanding of the syntax.

• Also add an anchor to the new page with a link to the new section of the (current Cloud version's) release notes to help ease the transition

To test: Confirm that hitting https://deploy-preview-19111--cockroachdb-docs.netlify.app/docs/cockroachcloud/upgrade-to-v24.2 redirects to the new page

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Files changed:

• src/current/_data/redirects.yml
• src/current/cockroachcloud/upgrade-cockroach-version.md

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