Keyboard navigation to the footer on the search page is impossible

[obulat]

Description

If you try to navigate the site using the keyboard Tab, you will not be able to get to the footer. After the last element in main, your focus goes to the beginning (header).

Reproduction

1. Navigate through the search results using the Tab key.
2. After passing the external search form, you will see that you land on the header.

Screenshots

Additional context

The intention behind the focus management is to allow the user to navigate to the filters sidebar after passing the filters button, instead of going through all of the search results (the natural order). This is the composable that handles it: https://github.com/WordPress/openverse-frontend/blob/main/src/composables/use-focus-filters.ts
We need to move the point of where the focus is moved back to the beginning of the site from the end of "main" to the end of "footer".