Added a single source of truth for keypair authentication in Snowflake

[ian-at-airbyte]

What

• Replace duplicated and out-of-date content with one source of truth
• Updated all Snowflake documentation to use it.
• Added links to Snowflake's documentation to troubleshoot.

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 22, 2025 7:51pm

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