Migrate using Oracle GoldenGate

[gemma-shay]

https://cockroachlabs.atlassian.net/browse/DOC-8306

[github-actions]

Files changed:

• src/current/_includes/v23.1/sidebar-data/migrate.json
• src/current/_includes/v23.2/sidebar-data/migrate.json
• src/current/v23.1/goldengate.md
• src/current/v23.2/goldengate.md

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[gemma-shay]

Thanks @cotedm ! Incorporated your review and some other improvements. Going to tag in Ryan as well.

[taroface]

Requesting some bigger changes to the enumerated steps, because I think the snippets need to be more clearly segmented and explained based on the commands that are in them. This should require another tech review. Let me know if you have questions!

Also, I left comments on 23.1 but they apply to 23.2 of course.

[taroface]

Just 1 comment! Thanks for all the work on this.

Addressed all comments