Skip sidekiq transaction check in development seed

What does this MR do and why?

Skip sidekiq transaction check in development seed. It doesn't matter whether that worker runs sucessfully, or not.

This worker was introduced in e5f31632, but 20_nested_groups seed was missed because it was optional.

Fixes the error below:

== Seed from /Users/kushal/Code/GL/gitlab/db/fixtures/development/20_nested_groups.rb
rake aborted!
Sidekiq::Worker::EnqueueFromTransactionError: `Namespaces::InviteTeamEmailWorker.perform_in` cannot be called inside a transaction as this can lead to
race conditions when the worker runs before the transaction is committed and
tries to access a model that has not been saved yet.

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