RDSC-4297: Update RDI Oracle XStream setup steps and clarify them

[ZdravkoDonev-redis]

1. I added a few very important notes in the SQL scripts
2. I added the last step, without which nothing will work - actually making RDI to use the custom Debezium image.

[github-actions]

Staging links:
https://redis.io/docs/staging/RDSC-4297-rdi-update-oracle-xstream-steps/integrate/redis-data-integration/data-pipelines/prepare-dbs/oracle/

[Copilot]

Pull request overview

This PR enhances the Oracle XStream setup documentation for RDI by adding critical setup instructions and clarifications. The updates ensure users can properly configure RDI to use custom Debezium images for Oracle XStream connectivity, which was previously missing and would prevent the setup from working.

Key changes:

• Added important SQL script comments warning users to check if ARCHIVELOG mode is already enabled before executing database shutdown commands
• Clarified that database commands should be run as sysdba user instead of oracle user
• Added the critical step 5 documenting how to configure RDI to use the custom Debezium image via the rdi-operator configmap

Comments suppressed due to low confidence (1)

content/integrate/redis-data-integration/data-pipelines/prepare-dbs/oracle.md:652

• The subsection is labeled "5.1. For VM installation" which implies there should be other subsections (e.g., 5.2 for other installation types), but no additional subsections are provided. Consider either removing the "5.1" numbering and just using a descriptive heading like "For VM installation:", or adding subsections for other installation types if they exist.

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[andy-stark-redis]

@ZdravkoDonev-redis I've implemented some fixes: the Copilot stuff, renumbering the sections, and replacing the ASCII art with Mermaid diagrams (AI finds these easier to parse). The text otherwise LGTM, but you might want to have a quick check that my changes are OK.