Datasource: Pass access type to data source instance settings (#37577)

* Pass Access info to datasourceInstance

* Update packages/grafana-data/src/types/datasource.ts

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

* Type access as direct | proxy

* Fix tests where mocking datasourceInstance, include access

* Pass access to data source instance mocks

* Update comment

* Pass access to data source instance mocks

Co-authored-by: Giordano Ricci <me@giordanoricci.com>

plugins-bundled/internal/input-datasource/src/InputDatasource.test.ts

@@ -19,6 +19,7 @@ describe('InputDatasource', () => {
     type: 'x',
     name: 'xxx',
     meta: {} as PluginMeta,
+    access: 'proxy',
     jsonData: {
       data,
     },