Force build to fail on Docusaurus plugin exceptions

[Blargian]

Summary

Build is not failing in production on the front-matter validator and floating page checker.
Makes a change so that the build will fail if these checks detect an issue.

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 10, 2025 0:49am

3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs-jp	⬜️ Ignored (Inspect)			Apr 10, 2025 0:49am
clickhouse-docs-ru	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 0:49am
clickhouse-docs-zh	⬜️ Ignored (Inspect)	Visit Preview		Apr 10, 2025 0:49am