fix: Using "Save & continue editing" on a new insight doesn't redirect to /insights/<short_id>

[gitstart]

Problem

Using "Save & continue editing" on a new insight doesn't redirect to /insights/<short_id> This should redirect the user to the edit page with the id of the newly saved insight in the url but it isn't currently

Changes

fixes #11049

before & after

Loom Video

Ref

How did you test this code?

[gitstart]

@Twixes, @benjackwhite, Ready for review

[gitstart]

@benjackwhite, Still up for review

[gitstart]

@benjackwhite, Changes have been addressed

[gitstart]

@Twixes, Ready for review

[gitstart]

Unfortunately this doesn't fix the core issue. This will indeed redirect but not to the correct place as it should redirect to the "edit" view and not the standard view.

This change so far just makes it behave as the usual save button

Should the test be updated to reflect this?

[Twixes]

Closing in favor of #12384.