[DS-795] Fix redirect after login for Virtual Y App in LB

Steps to test:

[ ] Enable Layout Builder module.
[ ] Enable openy_gc_auth_example module.
[ ] Create Content Type for Layout Builder.
[ ] Create node and add Virtual Y Content Block via Layout Builder.
[ ] Create another node with Virtual Y Login Block via Layout Builder.
[ ] Set up Virtual Y Landing Page url and Virtual Y Login Landing Page url fields on settings page: admin/openy/virtual-ymca
[ ] Observe redirect to the node with Virtual Y Content Block
[ ] Navigate to the page with Virtual Y Content Login block and hit Enter Virtual Y button.

Please check these boxes to confirm this PR covers the following cases:

Maintaining our upgrade path is essential. Check one or the other:
- [ ] This PR provides updates via hook_update_N or other means.
- [ ] No updates are necessary for this change.
Front end fixes should be tested against all of the Open Y Themes.
- [ ] Tested against Carnation
- [ ] Tested against Lily
- [ ] Tested against Rose
- [ ] This change does not contain front-end fixes.
[ ] I have flagged this PR "Needs Review" or pinged the VY devs/QA team in Slack