Follow up for #8255

Describe the problem and steps to reproduce it:

The links for Source code upload displayed in the add-on submission flow should be:
https://extensionworkshop.com/documentation/publish/source-code-submission/?utm_source=addons.mozilla.org&utm_medium=devhub&utm_content=submission-flow

Currently, the links are pointing to https://extensionworkshop.com/documentation/publish/source-code-submission/, without utms