Changes to Get workflow stats

the query request parameter execution_product was restricted to a list of enum values

query request parameter since list-of-types was narrowed by removing types null

query request parameter until list-of-types was narrowed by removing types null

added the new enum value hooks to the query request parameter execution_product

added the new enum value workflows to the query request parameter execution_product

for the query request parameter execution_product, the type was generalized from no type to string

for the query request parameter since, the type was generalized from no type to string

for the query request parameter until, the type was generalized from no type to string

added the new optional query request parameter execution_product

added the non-success response with the status 422

the security scope read_only was added to the endpoint's security scheme PersonalAccessTokenAuth

the security scope full_access was removed from the endpoint's security scheme PersonalAccessTokenAuth

the endpoint scheme security PersonalAccessTokenAuth was added to the API