fix: write MVs to xapi schema again

[SoryRawyer]

This change overrides the destination database for the materialized views that were once written to the xapi schema so that they can be written to the correct database again. Note: while database is the preferred term when it comes to dbt and ClickHouse, dbt does not seem to recognize database as a valid configuration parameter for model destinations, hence the use of the schema keyword argument in the config block.

This change also requires profiles.yml to pass prod as the target instead of dev. I have updated sample_profiles.yml to match the expected configuration. This also means that the profile in tutor-contrib-aspects will need to be updated as well.

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[openedx-webhooks]

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[bmtcril]

Released as v3.1.2