Don't attempt Issue rate liming for CSV imports

What does this MR do and why?

This MR ensures that Issues created via CSV import will not be rate limited. We may need to change this in the future, but since !68526 (merged) has been merged (but not enabled until %14.5), all Issues created via Issues::CreateService are now subject to rate limiting (when enabled).

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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 #342678