Auth: Add request context to UserInfo calls (#70007)

* use context for UserInfo requests

* set timeouts for oauth http client

* Update pkg/login/social/common.go

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

---------

Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/login/social/grafana_com_oauth_test.go

@@ -1,6 +1,7 @@
 package social
 
 import (
+	"context"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -81,7 +82,7 @@ func TestSocialGrafanaCom_UserInfo(t *testing.T) {
 				}
 			}))
 			provider.url = ts.URL
-			actualResult, err := provider.UserInfo(ts.Client(), nil)
+			actualResult, err := provider.UserInfo(context.Background(), ts.Client(), nil)
 			if test.ExpectedError != nil {
 				require.Equal(t, err, test.ExpectedError)
 				return