Service accounts: Apply None role by default for creating SA (#75949)

* none role by default

* tests

public/app/features/serviceaccounts/ServiceAccountCreatePage.test.tsx

@@ -83,7 +83,7 @@ describe('ServiceAccountCreatePage tests', () => {
     await waitFor(() =>
       expect(postMock).toHaveBeenCalledWith('/api/serviceaccounts/', {
         name: 'Data source scavenger',
-        role: 'Viewer',
+        role: 'None',
       })
     );
   });

public/app/features/serviceaccounts/ServiceAccountCreatePage.tsx

@@ -29,7 +29,7 @@ export const ServiceAccountCreatePage = ({}: Props): JSX.Element => {
   const [serviceAccount, setServiceAccount] = useState<ServiceAccountDTO>({
     id: 0,
     orgId: contextSrv.user.orgId,
-    role: OrgRole.Viewer,
+    role: OrgRole.None,
     tokens: 0,
     name: '',
     login: '',