Revert "API-26059 Log durations of some sidekiq jobs (#12474)"

[caseywilliams]

Summary

Related issue(s)

• This code is no longer needed now that DataDog access has been granted to the appeals team
• It looks like there is some issue with require statements when running sidekiq jobs locally - see this support thread. We could fix the require statement, but it seems like just removing this code would be most efficient.

Testing done

What areas of the site does it impact?

Removes sidekiq middleware

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog or Grafana (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

[kristen-brown]

I compared it with the original PR that added the middleware, and it looks good!