Update 2K CNH RA example to follow latest

What does this MR do?

MR updates the 2k Cloud Native Hybrid Reference Architecture example to follow the changes made after a recent review:

• Webservice pods have been switched from 2 worker to 4 worker to align with other Architectures and allow for better Puma shared memory management
• Increase of Sidekiq workers / pods from 2 to 4 (Omnibus + Cloud Native Hybrid)

Related issues

Relates gitlab-org/quality/reference-architectures#146 (closed)

Author's checklist

• Consider taking the GitLab Technical Writing Fundamentals course
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• ~"feature"
• ~"frontend"
• ~"backend"
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These labels cause the MR to be added to code verification QA issues.

Review checklist

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