[Studio] Add runtime detail modals

[Aias00]

Summary

• add a Proxy detail modal on the cluster page
• add a client connection detail modal on the client page
• consolidate related runtime detail modal PRs into one review unit

Supersedes

#590 #591

Tests

• npm ci --ignore-scripts --no-audit --no-fund && npm test -- --run src/pages/cluster/__tests__/ClusterPage.test.tsx src/pages/cluster/__tests__/ClientsPage.test.tsx
• git diff --check

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