fix(tinybird): pipe aliases

[epipav]

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[joanagmaia]

LGTM

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Pull request overview

This PR replaces the collections.* wildcard select in the collections_filtered Tinybird pipe with an explicit, fully-aliased column list. In Tinybird/ClickHouse, wildcard expansion combined with FINAL joins and GROUP BY can produce non-deterministic or prefixed output column names; enumerating and aliasing each column ensures the endpoint exposes stable, unprefixed column names that downstream pipes (collections_list, search_collections_projects_repos) rely on.

Changes:

• Expanded collections.* into 12 explicit collections.<col> AS <col> projections.
• Column set and aliases match the collections datasource schema exactly and remain consistent with the existing GROUP BY.

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