Backfill runner_type, sharding_key_id columns on ci_runner_machines

Pedro Pombeirorequested to merge
pedropombeiro/497526/retry-backfill-ci_runner_machines-columns into master

What does this MR do and why?

This MR adds a batched migration to backfill runner_type, sharding_key_id columns on ci_runner_machines.

The initial migration was rolled back as part of a larger revert (it wasn't directly related to the incident, but was part of the same MR and hence reverted with it).

This time around, I've split the logic into a separate MR.

Changelog: added

Part of #497526 (closed)

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Edited by Pedro Pombeiro

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