setting the sso login successs sample rate to be 1, same as the sso error (#17568)

src/sentry/auth/helper.py

@@ -150,7 +150,7 @@ def handle_existing_identity(
         return HttpResponseRedirect(auth.get_login_redirect(request))
 
     state.clear()
-    metrics.incr("sso.login-success", tags={"provider": provider.key}, skip_internal=False)
+    metrics.incr("sso.login-success", tags={"provider": provider.key}, skip_internal=False, sample_rate=1.0)
 
     return HttpResponseRedirect(auth.get_login_redirect(request))