Auth: Set the default org after User login (#83918)

* poc

* add logger, skip hook when user is not assigned to default org

* Add tests, move to hook folder

* docs

* Skip for OrgId < 1

* Address feedback

* Update docs/sources/setup-grafana/configure-grafana/_index.md

* lint

* Move the hook to org_sync.go

* Update pkg/services/authn/authnimpl/sync/org_sync.go

* Handle the case when GetUserOrgList returns error

---------

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
Co-authored-by: Karl Persson <kalle.persson@grafana.com>

conf/sample.ini

@@ -449,6 +449,9 @@
 # Require email validation before sign up completes
 ;verify_email_enabled = false
 
+# Redirect to default OrgId after login
+;login_default_org_id =
+
 # Background text for the user field on the login page
 ;login_hint = email or username
 ;password_hint = password