Redshift/BigQuery Linked Audiences GA + Materialized view requirements [DOC-1094]

[pwseg]

Proposed changes

• Removed beta callouts for Redshift and BigQuery setup docs. They will be GA on 11 April 2025.
• Added a callout to the Data Graph Prerequisites section clarifying that both materialized and unmaterialized tables must be selected in Profiles Sync (due to current schema inference behavior).
• Updated recommendation language throughout the page to formally guide users toward materialized views.
• Removed passive or neutral framing around unmaterialized views. We don't want to present it as an equivalent/recommended option.
• Rewrote the type parameter description to only show segment:materialized, with a fallback note to contact support.

Merge timing

• ASAP once approved

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