Add galaxy events to cloud advert and translation issue banner

[Blargian]

Summary

Adds galaxy events to:

• Cloud sidebar advert
• Translation issue banner
• Cloud Callout on the install page

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

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Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview		Jun 6, 2025 10:47pm

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Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs-ru	⬜️ Ignored (Inspect)	Visit Preview		Jun 6, 2025 10:47pm
clickhouse-docs-zh	⬜️ Ignored (Inspect)	Visit Preview		Jun 6, 2025 10:47pm