No-op BackfillSlackIntegrationsScopesShardingKey BBM

Mario Celirequested to merge
560356-no-op-BackfillSlackIntegrationsScopesShardingKey into master

What does this MR do and why?

We are going to have to retry this migration as some edge cases were found on the code that cascades scope updates to multiple slack_integrations.

I will also create a backport for 18.7 so thsi BBM is not run as we know it might fail and will have to be re-queued anyway.

More details on the failure at !215658 (comment 2958462457)

Related to #560356

Edited by Mario Celi

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