Temporarily turn off scheduled image data refreshes, increase matview refresh timeout

[stacimc]

Description

Sets the schedule for the image data refresh to None. This allows us to keep the DAG enabled in order to do manual runs, without the weekly scheduled runs triggering. We need to do this temporarily due to ongoing issues with the popularity matview refresh, which have caused the data refresh to dramatically increase in runtime and exceed the 1-week window.

This also increases the timeout for the matview refresh step from 3 days to 6 days, after the recent run timed out once again.

Note: this PR does not touch the audio data refresh.

Testing Instructions

Pull this branch and run just up. Check that the schedule for the image data refresh is now None in the Airflow UI:

Enable the DAG and verify that no dag run is triggered automatically. Manually trigger a DAG run, and then inspect the update_materialized_popularity_view task instance to verify that its timeout has been increased to 6 days.

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[AetherUnbound]

Looks great, thanks so much for making this change!