DOC-1743 Document feature Private Networking Phase 1

[micheleRP]

Description

This pull request adds private networking via AWS PrivateLink for Serverless clusters.

• Updated the cloud overview table to indicate that Serverless clusters now support private networking, and removed references implying this feature is unavailable in Serverless. [1] [2]
• Added documentation explaining how Serverless clusters on AWS can enable private access using AWS PrivateLink, including details about configuration and associated charges.
• Removed "Private networking" from the list of features exclusive to BYOC and Dedicated clusters, reflecting its availability in Serverless.
• Updated instructions in multiple networking setup guides to refer to the "Networking" page instead of the "Networks" page, ensuring consistency with the current UI. [1] [2] [3]

Resolves https://redpandadata.atlassian.net/browse/DOC-1743
Review deadline:

Page previews

• Create Serverless Cluster
• Networking - Cloud UI
• Networking - Cloud API
• Cloud Overview- What's New

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch DOC-1743-Document-feature-Private-Networking-Phase-1

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