fix: use real MCP servers for catalog demo

[Deepak8858]

Replaces fake AI-generated or generic MCP servers with real ones in the catalog demo data. Specifically:\n\n1. Updated Kubernetes MCP Server to use .\n2. Replaced the generic 'Standalone MCP Server' with 'Google Maps MCP Server'.\n\nFixes #2384

[google-oss-prow]

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[pboyd]

Hi @Deepak8858, thanks for the PR. I'll leave it for someone more knowledgeable than me on the BFF to review, but this doesn't really solve #2384, because that was specifically about the demo manifests, not BFF mock data.

btw, you'll need to add the "Sign-off" line to your commit message to pass the DCO check (git commit --amend -as; git push -f is probably all you need, but click the link for the failing check for the instructions).

/ok-to-test