refactor(clickpipes): reverse private link for postgres

[iamKunalGupta]

Summary

Includes the following changes:

1. Remove from “requirements” section the region requirement: https://clickhouse.com/docs/knowledgebase/aws-privatelink-setup-for-clickpipes.
   • Add an info-banner that says this is more suitable for cross-region private links.
2. In https://clickhouse.com/docs/integrations/clickpipes/aws-privatelink - in RDS info-box for VPC end-point service make it clear that for cross-region only VPC endpoint service is supported.
3. Make sure to update the home-page for Postgres CDC to link to the self-serve private link docs.

Additionally include MySQL in list of supported ClickPipes sources

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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