Remove bbm_retry_sidekiq_shutdown_exception feature flag

Krasimir Angelovrequested to merge
366720-clenup-bbm_retry_sidekiq_shutdown_exception into master

What does this MR do and why?

Remove bbm_retry_sidekiq_shutdown_exception feature flag. It has been enabled for a while on production, and works as expected - #542900 (comment 2693979177).

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Related to #366720 (closed)

Edited by Krasimir Angelov

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