Changes to Suggest Google Ads search themes

added the non-success response with the status 503

the endpoint scheme security WorkspaceApiKeyAuth was added to the API

the endpoint scheme security WorkspaceApiKeyBearerAuth was added to the API

header request parameter Accept-Language list-of-types was narrowed by removing types null

for the header request parameter Accept-Language, the type was generalized from no type to string

the endpoint scheme security PersonalAccessTokenAuth was added to the API

endpoint added