Follow-up from Add the right side of 'code flow' that including code viewer

The following discussion from !158532 (merged) should be addressed:

•   @mfangman start a discussion:

In this MR, the Edit button for each code file uses a primary confirmation variant. I assume this is the default button style for the code file component. However, I'm not sure this action needs such visual prominence given the context. When AI actions are present on the page (issue for reference), we want to ensure they stand out as the primary actions for users. I'd recommend updating the Edit button to a default variant instead. This is something that can be handled as a follow-up if desired.