Remove performance link from navigation

[DominikB2014]

The domain overview pages have been out for awhile, we should remove remove the old performance landing page link in the sidebar. There is some details about that here https://www.notion.so/sentry/Migrating-away-from-perf-landing-page-1828b10e4b5d804bb74ee89d5a63d486?pvs=4

Here are the changes required

Navigating to the transaction summary outside a domain view

• continues to go to the existing performance transaction page
• The breadcrumbs are updated to be Insights > Transaction Summary, the insight crumb does not link anywhere
• insights gets highlighted in the sidebar

Performance Landing page

• There should be no links to the performance landing page, do an audit if there are and see if they can be changed
• We can still keep this route around, just in case

Sidebar

• (temporary while we transition) Clicking on the performance link in the sidebar goes to the frontend, backend or mobile overview page. The page that it goes to can use the same logic as the existing performance landing page does with the frontend/backend/mobile tabs. This puts less pressure to make sure project -> domain mapping works well