Search upgrade flow [core]: Land users on the Search page upon purchase from My Jetpack

When users purchase Search from the Dashboard, we land them on the Search plugin page.
When users purchase from MyJetpack, they are brought back to My Jetpack after checkout.

Let’s have them land on the Search plugin page instead.


p1HpG7-l2l-p2
See task 10

The relevant flow is the My Jetpack purchase checkout and its return destination, with the Search plugin page as the intended landing point. Start by tracing the post-checkout navigation from My Jetpack, then verify that a Search purchase lands on the Search plugin page rather than returning to My Jetpack.

Written by the indexing model from the issue text.