Remove deprecated upload route

What does this MR do and why?

This is a super late follow up to !22822 (merged)

This was supposed to be removed in 13.0

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 #196396 (closed)