JWT Authentication: Add support for specifying groups in auth.jwt for teamsync (#82175)

* merge JSON search logic

* document public methods

* improve test coverage

* use separate JWT setting struct

* correct use of cfg.JWTAuth

* add group tests

* fix DynMap typing

* add settings to default ini

* add groups option to devenv path

* fix test

* lint

* revert jwt-proxy change

* remove redundant check

* fix parallel test

pkg/services/authn/authnimpl/usage_stats_test.go

@@ -21,7 +21,7 @@ func TestService_getUsageStats(t *testing.T) {
 	svc.cfg.DisableLogin = false
 	svc.cfg.BasicAuthEnabled = true
 	svc.cfg.AuthProxyEnabled = true
-	svc.cfg.JWTAuthEnabled = true
+	svc.cfg.JWTAuth.Enabled = true
 	svc.cfg.LDAPAuthEnabled = true
 	svc.cfg.EditorsCanAdmin = true
 	svc.cfg.ViewersCanEdit = true