Remove redundant spec

What does this MR do and why?

This spec isn't working properly because it's missing the sidekiq_inline tag. We don't need this spec anyway since we already test this in the service specs.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #346390 (closed)