Auth: Fix orgrole picker disabled if isSynced user (#64033)

* fix: disable orgrolepicker if externaluser is synced

* add disable to role picker

* just took me 2 hours to center the icon

* wip

* fix: check externallySyncedUser for API call

* remove check from store

* add: tests

* refactor authproxy and made tests run

* add: feature toggle

* set feature toggle for tests

* add: IsProviderEnabled

* refactor: featuretoggle name

* IsProviderEnabled tests

* add specific tests for isProviderEnabled

* fix: org_user tests

* add: owner to featuretoggle

* add missing authlabels

* remove fmt

* feature toggle

* change config

* add test for a different authmodule

* test refactor

* gen feature toggle again

* fix basic auth user able to change the org role

* test for basic auth role

* make err.base to error

* lowered lvl of log and input mesg

docs/sources/setup-grafana/configure-grafana/feature-toggles/index.md

@@ -89,6 +89,7 @@ Alpha features might be changed or removed without prior notice.
 | `lokiQuerySplitting`               | Split large interval queries into subqueries with smaller time intervals                                  |
 | `lokiQuerySplittingConfig`         | Give users the option to configure split durations for Loki queries                                       |
 | `individualCookiePreferences`      | Support overriding cookie preferences per user                                                            |
+| `onlyExternalOrgRoleSync`          | Prohibits a user from changing organization roles synced with external auth providers                     |
 | `drawerDataSourcePicker`           | Changes the user experience for data source selection to a drawer.                                        |
 | `traceqlSearch`                    | Enables the 'TraceQL Search' tab for the Tempo datasource which provides a UI to generate TraceQL queries |
 | `prometheusMetricEncyclopedia`     | Replaces the Prometheus query builder metric select option with a paginated and filterable component      |