Redirect to primary DC upon logout

### Overview of the Issue

We have OIDC Auth method in the primary DC and global replication of the tokens.
If we then change to a secondary DC and logout and then try to login again it tries to login to the secondary DC which doesn't have any OIDC auth method.

We would like it so it redirects to the primary DC upon logout.

### Reproduction Steps

Steps to reproduce this issue/view the area for improvement, eg:

1. Login to the UI using OIDC
1. Change DC and then logout
1. Click the Log in button and no OIDC option is available

### Describe the solution you'd like

After logout the user should be redirected to the primary DC.

### Consul Version

1.10.4+ent

### Browser and Operating system details

Chrome, Version 94.0.4606.54 (Official Build) (64-bit), Arch Linux

Start by reproducing the logout flow: authenticate with OIDC, switch to a secondary data center, log out, and select Log in. Trace how the UI chooses the data center after logout and verify that completion redirects to the primary data center, where the OIDC option is available.

Written by the indexing model from the issue text.