Simplify account linking data. Change `institution.name` to `institutionName`
Update emailAlreadyLinked value. The layout checks for 'primary' and 'secondary', not a boolean, so update data passed
Add error messages to Account Linking pages
Rename account linking file name to reflect route change. Changed `institution` to `institutional` on the login route.
GitOrigin-RevId: 4e12b9ec7c1577efbaa8c0628e3c41c70114844e
