Remove exempt_from_sharding helper

Tomasz Skoruparequested to merge
tskorupa/remove-exempt_from_sharding-helper into master

What does this MR do and why?

Remove exempt_from_sharding helper

Completes #541118 (closed)

We have a number of tables where we allow exempt_from_sharding to skip sharding. This should not be allowed anymore. As it breaks the isolation of Organizations.

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