Security: Store datasource passwords encrypted in secureJsonData (#16175)

* Store passwords in secureJsonData

* Revert unnecessary refactors

* Fix for nil jsonSecureData value

* Remove copied encryption code from migration

* Fix wrong field reference

* Remove migration and provisioning changes

* Use password getters in datasource proxy

* Refactor password handling in datasource configs

* Add provisioning warnings

* Update documentation

* Remove migration command, moved to separate PR

* Remove unused code

* Set the upgrade version

* Remove unused code

* Remove double reference

pkg/services/provisioning/datasources/config_reader.go

@@ -62,8 +62,8 @@ func (cr *configReader) parseDatasourceConfig(path string, file os.FileInfo) (*D
 	}
 
 	if apiVersion.ApiVersion > 0 {
-		var v1 *DatasourcesAsConfigV1
-		err = yaml.Unmarshal(yamlFile, &v1)
+		v1 := &DatasourcesAsConfigV1{log: cr.log}
+		err = yaml.Unmarshal(yamlFile, v1)
 		if err != nil {
 			return nil, err
 		}