Update pages and requests schemas written by agent to BQ to a new one

[max-ostapenko]

The older data schema is being reprocessed using these queries:

• https://github.com/HTTPArchive/dataform/blob/main/definitions/extra/migration/reprocess_pages.js
• https://github.com/HTTPArchive/dataform/blob/main/definitions/extra/migration/reprocess_requests.js

After we promote these new schemas to be the new default we need to update agent processing.

We should be able to just do SELECT * when copying data from crawl_staging to crawl in crawl_complete pipeline.

[max-ostapenko]

The transformation of crawl_staging.requests into crawl.requests lasted ~13h for Nov 2024 crawl (not including failed attempts).

@pmeenan let's update the wptagent to match crawl_staging with crawl schema.
As agreed we will not update legacy table anymore, so ready for a cleanup.