M28 rebase

[jezdez]

This removes these commits:

• don't autoexecute query on changing datasource (fixed upstream)
• Add compare query version support (70fccdfc11209696c8e99b19233f3f00ee6fe65f, deprecated)
• Merge mozilla schema updates with schema from master (3bdf9d8d3cfc8a1aad31a426a49f3bd4e6e83ca0, deprecated)
• Unique names for query parameters (1dc6c4a44359d6c5b2137c02477c3030527415ea, deprecated)
• Use production build of react when deployed (d3ebc467aa7daaf286d4935353012b0621645825, fixed upstream)
• Show number of queries ahead in queue when executing (708a0b42d7440eb0d45a57622eabfc4b0c7dc7c3, deprecated)
• Aggregate query results (708a0b42d7440eb0d45a57622eabfc4b0c7dc7c3, deprecated)
• Updated redash-stmo to Python 3 compatible and add redash-iodide (a08b60ccd65a333d12ae0d68ff43b8bf0db5ffae, unneeded)

New added:

• Fix scheduler docker environment (ce5e60672, need to port upstream)
• Remove old migrations and delete data from query resultsets feature (2bf11d8e6, to be removed at next rebase)

[jezdez]

Just to clarify @robhudson, this PR exists for code review and trying things out, not to actually merge this here.