fix: verify view is inaccessible (#8557)

Fixes https://github.com/payloadcms/payload/issues/8470

Cleans up the way we redirect and where it happens.

## Improvements
- When you verify, the admin panel will display a toast when it
redirects you to the login route. This is contextually helpful as to
what is happening.
- Removes dead code path, as we always set the _verifiedToken to null
after it is used.

## `handleAdminPage` renamed to `getRouteInfo`
This function no longer handles routing. It kicks that responsibility
back up to the initPage function.

## `isAdminAuthRoute` renamed to `isPublicAdminRoute`
This was inversely named as it determines if a given route is public.
Also simplifies deterministic logic here.

## `redirectUnauthenticatedUser` argument
This is no longer used or needed. We can determine these things by using
the `isPublicAdminRoute` function.

## View Style fixes
- Reset Password
- Forgot Password
- Unauthorized

packages/next/src/views/ResetPassword/index.scss

@@ -1,33 +1,11 @@
 @import '../../scss/styles.scss';
 
 @layer payload-default {
-  .reset-password {
-    &__wrap {
-      z-index: 1;
-      position: relative;
+  .reset-password__wrap {
+    .inputWrap {
       display: flex;
       flex-direction: column;
-      align-items: flex-start;
       gap: base(0.8);
-      max-width: base(36);
-
-      & > form {
-        width: 100%;
-
-        & > .inputWrap {
-          display: flex;
-          flex-direction: column;
-          gap: base(0.8);
-
-          > * {
-            margin: 0;
-          }
-        }
-      }
-
-      & > .btn {
-        margin: 0;
-      }
     }
   }
 }