Auth: Refresh OAuth access_token automatically using the refresh_token (#56076)

* Verify OAuth token expiration for oauth users in the ctx handler middleware

* Use refresh token to get a new access token

* Refactor oauth_token.go

* Add tests for the middleware changes

* Align other tests

* Add tests, wip

* Add more tests

* Add InvalidateOAuthTokens method

* Fix ExpiryDate update to default

* Invalidate OAuth tokens during logout

* Improve logout

* Add more comments

* Cleanup

* Fix import order

* Add error to HasOAuthEntry return values

* add dev debug logs

* Fix tests

Co-authored-by: jguer <joao.guerreiro@grafana.com>

pkg/middleware/testing.go

@@ -44,6 +44,7 @@ type scenarioContext struct {
 	loginService         *loginservice.LoginServiceMock
 	apiKeyService        *apikeytest.Service
 	userService          *usertest.FakeUserService
+	oauthTokenService    *auth.FakeOAuthTokenService
 	orgService           *orgtest.FakeOrgService
 
 	req *http.Request