fix the deployment comparison page (add ECE, ECK)

[shainaraskas]

Summary

Fixes #2930

It was driving me insane. Added separate columns where needed (there are some infra differences between the deployment types, e.g. autoscaling and snapshot management)

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Although I didn't use AI to compile the info, I had AI tell me if there were any categories missing. We might consider adding these in the future:

• Cost/Pricing: Since the parent page mentions cost considerations, you might want a comparison row about pricing models
• Support and SLA: Different deployment types have different support models
• Upgrade process: How upgrades are handled differs significantly across deployment types
• API access: Availability of REST APIs, management APIs, etc.
• Networking/Connectivity: VPC peering, private link, IP filtering, etc.
• Backup/Recovery: Currently only "Snapshot management" - could expand on disaster recovery procedures
• Performance tuning: Control over JVM settings, index settings, etc.

doing a sweep of this would be hard, but we should consider adding to this page as we discover key points of comparison. this was just about correcting the things that were absolutely wrong. asking @eedugon for a gut check please (and anything you think absolutely should go on this page ASAP)

[github-actions]

✅ Vale Linting Results

No issues found on modified lines!

[github-actions]

🔍 Preview links for changed docs

• deploy-manage/deploy.md
• deploy-manage/deploy/deployment-comparison.md